Clutch slave cylinder bleeding procedure? (Question)

  • Follow the hydraulic line from the clutch master cylinder to locate the slave cylinder the easiest way. In order to bleed the slave cylinder, you need to remove its valve using a line wrench. The rest would be done by gravity. You should use a container or a pan under it to catch the fluid; let it be open for two to three minutes.

Do you have to bleed a clutch slave cylinder?

Air pockets prevent the hydraulic system from functioning properly. You may need to bleed the slave cylinder as part of routine maintenance procedures, such as replacing vehicle fluids or because you need to replace the slave cylinder.

How do you bleed a clutch slave cylinder without a bleeder screw?

The proper bleeding procedures for slave cylinders without bleed screws is as follows:

  1. Push the slave cylinder pushrod inward and disconnect both bands of the retaining strap to enable the pushrod to fully extend.
  2. Tilt the slave cylinder to a 45° angle.
  3. Insert the master cylinder line into the slave cylinder port.

Do you have to prime a slave cylinder?

Registered. Yes, you should prime it, and no, you don’t any special tools. When I installed mine, I followed the instructions in the Haynes book. Essentially what they have you do is to pump fluid into the slave cylinder through the bleed nipple, and then push any air bubbles out by compressing the cylinder by hand.

How do you pressure bleed a clutch?

To bleed your clutch, take the following steps:

  1. Jack up the front of the car.
  2. Open the hood.
  3. Remove the cap from the clutch fluid reservoir.
  4. Screw the pressure bleeder onto the top of the reservoir.
  5. Pump the clutch a few times.
  6. If using a power bleeder, watch the gauge and pump it to a PSI of about 12.

How do you bleed a clutch with no pressure?

Fill reservoir, Depress clutch pedal (person 2 or use a bar to block pedal down) Open bleed valve, close as soon as pressure goes, ( a pipe into a jar is good to keep area clean) Release pedal, wait 3 seconds then depress and hold again.

How long does it take to bleed a slave cylinder?

Place a drain pan under the slave cylinder to catch the brake fluid. Bleed the brake fluid – Leave the bleeder open and allow gravity to bleed the slave cylinder for one to three minutes.

How do you know if you have air in your clutch line?

If your clutch pedal feels soft or ‘spongy’ at any point as you press it to the floor, it’s a sign your clutch fluid is low. That spongy, inconsistent feeling is due to air in the clutch line from the master cylinder to the slave cylinder.

How do you bleed a clutch without a vacuum pump?

If you do not have a vacuum pump, you can do this manually with a friend. With the bleeder valve closed, have your friend depress the clutch pedal as far as they can. Open the bleeder valve and allow the fluid to run out until it slows down, while your friend maintains pressure on the clutch pedal.

Hydraulic Clutch Unit Bleeding Procedures

Procedures for Maintaining Safety Always follow the safety guidelines advised by the vehicle manufacturer, which may be found in your Shop and Owner’s Manual. *Please keep in mind that some external slave cylinders are not equipped with bleed screws. Some castings may appear to be lacking a bleeder, but a close inspection will reveal that there are no fluid flow holes in the casting. Despite the fact that these cylinders are the product of casting consolidations, the application does not call for the use of bleeder screws.

All slave cylinders are provided with a plastic pushrod retention band to keep the pushrod in place.

When the slave cylinder is reconnected to the vehicle, check to be that the pushrod retention strap is in position and securely fastened.

They are not intended to fail during subsequent clutch applications.

  1. Push the slave cylinder pushrod in and remove both holding bands from the retaining strap. Allow the pushrod to fully stretch after releasing it from the retaining strap. Please remember not to cut or discard the remaining STRAP.
  1. Pour brake hydraulic fluid into the hydraulic port while tilting the slave cylinder up to about 45 degrees
  2. Repeat until all air has been evacuated.
  1. Insert the clutch hydraulic tube into the slave cylinder hydraulic output port while the slave cylinder is still tipped up (replace the little rubber quad seal on the end of the metal tube connector and lube with clutch fluid), then insert the retention pin and drive it in with a drift punch. IMPORTANT: Only original replacements and components should be used
  2. Otherwise, the product will not function properly.
  1. Hold the slave cylinder upright, with the pushrod pointing down toward the ground. In a position that permits the slave cylinder to be lower than the master cylinder, place the pushrod against the palm of your hand.
  1. Allowing the pushrod to slowly sink into the slave cylinder bore (about 25–30 mm) while keeping an eye on the master cylinder reservoir for air bubbles Stroke the slave cylinder in this manner until no more air bubbles are entering the reservoir, which should take around 10 – 15 strokes.
  1. After removing the master cylinder reservoir lid, carefully insert the slave cylinder pushrod back into the slave cylinder and rejoin the two bands of the retention strap that were disconnected. This means that the slave cylinder is now ready to be mounted on the car.
  1. Make 15 to 20 short, fast strokes in and out of the master cylinder pushrod with your hand or foot on the pedal, or until the pushrod is firm.

In the event the system is already installed in the car, this section will apply.

  1. It is important to thoroughly clean the top and sides of the reservoir before opening it in order to prevent contamination of the system with dirt, water, and other foreign material.
  1. Remove the reservoir cover and diaphragm and fill the reservoir with DOT 3 brake fluid from a sealed container to about 12mm below the top of the reservoir. IMPORTANT: Do not fill the reservoir with fluid that has been bled from a system since it may be contaminated with contaminants. Never fill or lubricate the Clutch Hydraulic System with transmission fluid, motor oil, power steering fluid, or any other mineral oil fluid.
  1. Push the master cylinder pushrod in and out using your hand or foot at the pedal roughly 10-20 times, or until the pushrod is hard. If the pushrod is not firm, repeat the procedure. As a result of this action, air in the system will be allowed to escape through the master cylinder reservoir
  1. It may be essential to refill the reservoir with DOT 3 fluid.
  1. Open the bleed screw on the Slave Cylinder to let air and brake fluid escape
  1. Clutch pedal should be released as soon as the bleed screw is tightened. It is not necessary to overtighten the bleed screw (Torque 1.75 to 2.45 Nm). It is important to periodically check and replenish the reservoir as needed while bleeding the system, in order to avoid air being sucked back into the system
  1. Pump the clutch pedal several times
  2. If the clutch engagement is not sufficient, repeat steps 5, 6, and 7 until all of the air has been removed from the system.
  1. After the system has been bled, reattach the diaphragm and the reservoir lid. NOTE: During regular operation, little volumes of air may ultimately find their way out of the system
  2. This is normal.

How to Bleed a Slave Cylinder

Documentation Download Documentation Download Documentation Located in the hydraulic clutch system of automobiles with manual gearboxes, the slave cylinder is a vital component. The master cylinder and slave cylinder must be changed when they begin to leak fluid, and the fluid must be replenished at the same time. As a result of the addition of the new components, air is introduced into the system, resulting in a mild or non-existent clutch action when the pedal is depressed. You must first discharge air from the slave cylinder before you can bleed air from the hydraulic clutch system.

  1. 1 Raise the car on jackstands. Most likely, you will have to jack up your car in order to get to the slave cylinder located underneath it. To elevate the car off the ground high enough to work beneath it, slide the jack beneath one of the vehicle’s front jack points and either raise and lower it or spin the handle (depending on the sort of jack) to raise it up and off the ground
  • Always use jack stands to support a vehicle while working on it. If you have an owner’s handbook for your car, you can identify the recommended jack locations for your vehicle.
  • 2 Put on the proper personal protection equipment and go outside. Brake fluid can be irritating to the eyes and skin if not used properly. Prepare yourself by putting on gloves and safety glasses before you begin working with it to help protect you from any brake fluid that may spill or dribble onto you while you are working.
  • Because you will be working under the car, you may want to consider using goggle-style eye protection rather than regular safety glasses to safeguard your eyes. Gloves made of neoprene or latex will save your hands from becoming coated with brake fluid.
  • Advertisement
  • s3 Fill a Coke bottle halfway with a clear hose. Cut an eight to ten-inch piece of clear hose with an internal diameter of 1/8 inch from a roll of clear hose. One end should be inserted into an empty soda bottle. Once you’ve started the bleeding procedure, this will act as your brake fluid catch container.
  • You may direct the flow of braking fluid by using the hose to drain it out of the system. The brake fluid will be collected in the bottle as it empties.
  • 4 Make sure you have the proper brake fluid. During the process of flushing the old brake fluid out of the slave cylinder, it is critical to refill the brake master cylinder with the appropriate type of brake fluid. It’s possible to find out what sort of fluid you need to purchase in your car owner’s handbook, or it may be written on the top of the master cylinder reservoir in your engine compartment
  • Alternatively, you may ask the cashier at your local auto parts store to find up the appropriate type of brake fluid for your application. Using the incorrect type of braking fluid can cause harm to the system and perhaps lead it to fail.
  1. First, make sure there is enough fluid in the master cylinder. Check the amount of braking fluid in the reservoir on the master cylinder by removing the cap from the reservoir and opening it. The fluid should be able to fill the reservoir to the top of the line. Otherwise, add fluid to the system to ensure that there is enough to prevent the system from sucking in air while you are bleeding it.
  • In fact, it’s perfectly OK to overfill the reservoir, because you will be emptying a significant volume of fluid from the system throughout the bleeding procedure.
  • 2 Find the bleed screw on the slave cylinder and tighten it. It is recommended that your vehicle’s slave cylinder be situated in close proximity to the transmission, albeit the precise positioning of the slave cylinder will vary from use to application. The bleed screw can be found on the bottom or underside of the slave cylinder, depending on your preference. It has the appearance of a bolt with a nozzle protruding from it.
  • If you are having trouble locating the slave cylinder or the bleed screw, consult the service manual for your car.
  • 3 Attach the hose to the bleed screw using a hose clamp. Place one end of a transparent hose on the slave cylinder bleed screw and the other end in an empty soda bottle to complete the circuit. This will govern the direction in which the released brake fluid will move when you bleed the system and will also serve as a catch-all receptacle for the fluid.
  • Ascertain that the hose is tightly pushed against the nozzle. As a precaution, place the soda bottle on a level surface such as the ground or a box to prevent it from tipping over
  • 4 Turn the bleed screw on the slave cylinder to the open position. The bleed screw should be turned counter clockwise using an open ended wrench while the hose is linked to it. This will allow fluid to be forced through the system and into the hose as a result of the system being opened.
  • It is critical to keep the hose connected to the nozzle at all times in order to avoid leaking brake fluid
  • For the time being, leave the screw open.
  • 5 Have a buddy press the clutch pedal all the way in and keep it there for you. Allow a buddy to press the clutch pedal all the way down to the floor and keep it there while the bleed screw is open and the hose is in position. You should make it clear to your buddy that you do not want the pedal to release until you have closed the bleed screw
  • Otherwise, the pedal will release.
  • Whenever your friend presses the brake pedal all the way down, brake fluid will leak into the bottle through the line attached to the bleed screw
  • As a result, the bottle will fill up quickly. In order to view the fluid draining through the hose, position yourself such that you can see it.
  • 6 Tighten the bleed screw all the way. To tighten the bleed screw again, crank it clockwise with an open ended wrench while your friend presses down on the clutch pedal until it is completely depressed. In this manner, the hydraulic clutch system will be sealed once again, preventing air from being drawn back into the system through the bleed screw.
  • Similarly, if your friend releases the pedal before you have finished closing the bleed screw, air will be drawn into the system, lengthening the bleeding process considerably. It is important not to overtighten the bleed screw since you will need to open and close it several times.
  • 7 Instruct your friend to depress the clutch pedal. Allow your friend to disengage the clutch pedal while the bleed screw is still closed. As soon as the pedal has been retracted all the way to the top of its clutch throw, you may commence the bleeding procedure once more in order to eliminate any remaining air bubbles from the system.
  • Always double-check to see that the pedal has been released completely before re-opening the bleed valve.
  1. 1 Increase the amount of brake fluid used between each cycle of bleeding. When your friend’s foot is lifted off the clutch pedal, it indicates that one cycle of bleeding the slave cylinder has been completed. After you’ve closed the bleed valve and taken your friend’s foot off the brake pedal, open the brake fluid reservoir on the master cylinder and add brake fluid to guarantee that it doesn’t run out of brake fluid while you travel
  • Sucking air into the system by bleeding the slave cylinder with an empty reservoir will cause the system to suck air again. It is necessary to check the reservoir on a regular basis to ensure that it does not run out of fluid.
  • 2 While the hose is draining, look for air bubbles in the hose. Observe the transparent hose as your friend presses the clutch pedal to ensure that no dirt or air bubbles are drained along with the fluid during the process. Air bubbles may appear as bubbles or as gaps in the fluid as it goes through the hose depending on how they are formed. The procedure is complete when there are no more air bubbles after many rounds of bleeding.
  • Air bubbles in the system can cause your clutch system to only supply intermittent pressure
  • As a result, your clutch system will only deliver sporadic pressure. In some cases, intermittent pressure in the clutch system might cause the clutch not to disengage completely.
  • 3 Repeat the procedure as many times as necessary. Repeat the process of bleeding the clutch as many times as required until the bubbles cease escaping via the hose. Even after bleeding the system several times, bubbles may continue to form. This indicates a leak somewhere in the lines or at the master cylinder.
  • Once the bubbles have stopped pouring out of the reservoir, you may shut the bleed screw and replace the cover on top of it. A specialist will be required to locate and repair any leaks that may have occurred in the system
  • Otherwise, the leak will remain undetected.
See also:  Fix turbo failure? (Professionals recommend)

Create a new question

  • Question There is no pressure applied to the clutch pedal, which remains firmly planted on the floor. Will the pedal continue to raise if I keep bleeding it? Some automobiles need you to manually lift the clutch pedal while bleeding
  • Others do not. Question What should I do if I don’t have somebody to assist me in bleeding a Slave Cylinder? Make use of a tube as well as a glass. Fill the glass halfway with the fluid and attach one end of the tube to the bleeder on the other end. Place the opposite end of the tube into the glass of liquid. The clutch pedal will now spew out air when you press down on it, and when you let off of the pedal, it will just suck in additional fluid instead of air. Question When I pump the clutch, why does my new slave cylinder hiss with compressed air? Examine your vehicle to ensure that the bleeder valve is closed and that the brake lines coming from the clutch master cylinder to the slave cylinder are in fact tightly connected. If this is the case, it is probable that air is still circulating through the system. Check for leaks in the connections and bleed the system once more. Question What should I do if I bleed the clutch but the pedal is still soft and rattles after doing so? If the pedal is still soft after a few minutes, there is certainly still air trapped inside the mechanism. It should be bled on a regular basis, or it should be taken to a repair shop for an inspection. Question On a 2007 Ford Focus ST, where can you find the clutch slave cylinder bleeder valve? When driving a right-hand-drive car, it is located on the right-hand side of the vehicle
  • The nipple is located at the top of the transmission and is facing upward
  • Question What is the source of the lack of pressure on the clutch pedal? Because there is still a lot of air within. Continue to bleed it until you see that the resistance is not becoming any stronger. Then you’ve achieved your full capacity. if you bleed and bleed and still receive no resistance, you’ve got a leak in your system. Question What does it imply if my car won’t start unless I slam the clutch pedal all the way to the floor and hold it there? Your vehicle should be equipped with a clutch pressure sensor, which will only engage when sufficient pressure from the master cylinder indicates that the vehicle is ready to start. It is possible that you will need to replace your car’s fluid reservoir since it may be low and as a result, it will not engage as smoothly. Question My GMC car has a slave cylinder, but I cannot locate it. A slave cylinder that is located within the bell housing is most likely the source of the problem
  • Question Is it necessary to bleed the brakes if the slave cylinder and the brake master cylinder are the same? Most cars in this situation have a plastic divider in the brake fluid reservoir, which ensures that even if the ‘clutch half’ of the reservoir has air in it or has completely emptied during bleeding, the ‘brake half’ of the reservoir still contains fluid and does not allow air to enter the brake system, as is the case in many European cars. Furthermore, it serves as a safety precaution: if your clutch system fails, at the very least your brakes will continue to function. Question I’m bleeding the clutch, but I’ve lost all pressure in the system. What exactly went wrong? Make a thorough inspection of all of the joints. It’s possible that there are some leaks, or that you were unable to thoroughly bleed it. Try bleeding it again until all of the air in the tube has been expelled, and keep an eye on the fluid level in your reservoir at all times.

More information can be found in the following answers: Inquire about something There are 200 characters remaining. Include your email address so that you may be notified when this question has been resolved. SubmitAdvertisement

About This Article

the following link. Inquire about a problem a total of 200 characters are still available Fill up the blanks with your email address to be notified when your query is answered. SubmitAdvertisement

Did this article help you?

This type of master cylinder is positioned on the firewall at an angle that produces an air trap and makes bleeding extremely difficult or impossible in some situations. Figure 1 shows an example of an air trap in the pressure line leading to the Concentric Slave Cylinder (CSC) as it crosses over the vehicle frame, which is common practice. Please keep in mind that in order for your clutch to operate effectively, all of the hydraulic systems or components must be properly and thoroughly bled.

WARNING: Brake fluid can cause paint to peel off painted surfaces. Please read the warnings and cleaning instructions on the brake fluid container carefully before using it. Consult your vehicle’s owner’s handbook for information on particular fluid parameters.

  1. For starters, we recommend that you bench-bleed the master cylinder and pressure line as part of the sub-assembly prior to putting it in the vehicle
  2. Master cylinder replacement Carefully remove the retaining pin from the old master cylinder and replace it with the new master cylinder, ensuring that the new line seal and holding pin are properly installed in the process. Before reusing a fitting, check it for signs of wear and tear. Installing the master cylinder push-rod at this time is not recommended. Install the replacement O-ring and sliding sleeve on the pressure line connector
  3. Then, reconnect the pressure line. Remove the reservoir cap and diaphragm boot, and fill the reservoir with new DOT 3
  4. Replace the cover and boot. Orient the reservoir, master cylinder, and line in the manner depicted in Figure 2. Air will be allowed to flow up into the reservoir and DOT 3 will be allowed to flow down into the system by carefully drawing the end of the pressure line downward
  5. As a replacement for the master cylinder push-rod, take a 4-inch No. 2 Phillips screwdriver and grip it in one hand while pushing the push-rod into the master cylinder roughly 3/8 inch at a time. Repeat this process many times and then refill the reservoir. Continue the procedure, giving a few minutes for the fluid to seep down into the system before proceeding. Starting at the bottom of the pressure line and working your way up to and including the master cylinder, tap on the line with a screwdriver handle. This assists in dislodging air bubbles
  6. It is common for bubbles to form in the fluid reservoir when they are ejected from the system as a result of this. Continue to make short pushes on the master cylinder push-rod while also refilling the reservoir until the push-rod becomes solid and cannot be compressed into the master cylinder body
  7. Once the push-rod has become solid and cannot be compressed, check the movement of the push-rod in the master cylinder body. When the push-rod is compressed, it should be less than 1/8″. If it can be pushed in more than 1/8″ it need more bleeding, which is accomplished by repeating procedures 4 through 7. Testing that has been installed: Immediately after installation into the vehicle and before connecting the line, lightly press on the clutch pedal with your palm to ensure that it is firm and has less than 1/8″ push-rod travel, as described in step 7. Figure 3 shows the installation and bleeding of the slave cylinder. Please do not remove the new up-graded retaining clip, as illustrated in Figure 3, from the slave cylinder connection when the vehicle is equipped with this feature. Insert the line into the slave cylinder with firm pressure. DOT 3 should be added to the reservoir to keep it fresh. A line and catch container should be attached to the bleed screw. During this procedure, open the bleed screw on the slave cylinder several turns and allow the fluid to drain out until no air bubbles are noticed
  8. While this is happening, check the reservoir fluid level. A total of 12 to 2 reservoirs worth of fluid should pass through the system to eliminate any trapped air. Make sure that the reservoir does not run out of water. Tighten the bleed screw until the release is confirmed. To purge air from the system, repeat this procedure as many times as necessary
  9. Fig. 4 displays the original connection system. It is not necessary to remove the internal holding ring.

THE FACTORY SERVICE MANUALS SHOULD BE REFERRED TO FOR DETAILED APPLICATION-SPECIFIC PROCEDURE INFORMATION. As a result of this advisory, you will be more confident in the safe and successful servicing of this application. Transmissions, transaxles, and transfer cases are large and heavy, and their safe removal and replacement necessitates the use of the correct tools, equipment, and techniques in order to avoid injury and damage to the vehicle’s transmission or transaxle. For thorough clutch servicing methods, always read and follow the instructions in instruction bulletins and original service manuals.

How to Bleed Slave Cylinders WITHOUT Bleed Screws

Some slave cylinders are manufactured without a bleed screw to purge air. If the slave cylinder has a gold allen screw, do not remove or loosen it. This set screw is not intended to be used for bleeding purposes. The proper bleeding procedures for slave cylinders without bleed screws is as follows: 1.Push the slave cylinder pushrod inward and disconnect both bands of the retaining strap to enable the pushrod to fully extend. Do not cut or discard the retaining strap. 2. Tilt the slave cylinder to a 45° angle. The master cylinder line port should be facing upward with the port at the high end of the slave. Fill the slave cylinder with fresh, clean brake fluid. 3.Insert the master cylinder line into the slave cylinder port. Lubricate the enclosed O-ring with brake fluid and insert the retaining pin. 4.Hold the slave cylinder vertically with the pushrod facing the ground. If this is not possible due to the master cylinder line, position the slave as far vertically as possible without putting excessive load on the master cylinder line. The slave cylinder must be lower than the master cylinder. 5.Remove the master cylinder cap. 6.Slowly push the slave cylinder pushrod into the slave approximately 1 inch, watching for air bubbles in the master cylinder reservoir. Air in the release system should be purged after 10 to 15 strokes of the slave cylinder pushrod. 7.After all air is purged from the system, slowly push the slave cylinder pushrod back into the slave and reconnect the two bands of the retaining strap. 8.Install the slave cylinder with the retaining strap in place. The retaining strap will break free with the first stroke of the pedal.Note: The plastic cover over the end of the pushrod must be retained; it acts as a lubricant between the pushrod and the fork. Removing the cover can cause a no release condition.
See also:  P0100 trouble code? (Best solution)

How To Bleed A Clutch

It is possible that air will become trapped within the clutch’s hydraulic system. When this occurs, you may have symptoms such as the following:

  • Change in pedal travel
  • Clutch does not fully disengage
  • Change in pedal travel Travel of the clutch pedal is soft or spongy in feel

When there is air in the system, the hydraulic fluid may not be able to properly activate the slave cylinder, resulting in the clutch not being entirely disengaged. As a result, two difficulties arise, both of which can be costly:

  • When you come to a complete stop, the clutch friction material is always slightly rubbing on the flywheel. It is possible that this will cause the friction material to wear down more quickly, resulting in a premature clutch replacement
  • Moreover, because the clutch does not fully disengage, some power will be transferred into the transmission during shifts. In the transmission, this results in wear on the synchros and gears.

The expense of repairing either problem can go into the hundreds of dollars. That’s why you should bleed your clutch as soon as you notice that air has become trapped inside the hydraulic system of your vehicle.

What Does It Mean To Bleed Your Clutch?

Image courtesy of LS2Forum Bleeding the clutch is simply the process of eliminating any undesired air that has become trapped in the clutch’s hydraulic system during operation. There are three alternative approaches to taking care of this. Listed below is a succinct overview of each method:

1. Manual Clutch Bleeding Process

Two people work together to operate the clutch pedal, with one person pumping it and another opening and closing the clutch bleed valve.

2. Pressure Process

A pressure bleeder is connected to the clutch master cylinder and is responsible for pressurizing the hydraulic system. It injects hydraulic fluid into the clutch master cylinder, which releases the clutch. This procedure is carried out as a person opens and closes the clutch bleed valve located at the slave cylinder, respectively.

3. Vacuum Process

A vacuum bleeder is attached to the slave cylinder bleeder valve, and it is responsible for drawing fluid from the master cylinder clutch. It then pulls and traps both fluid and air into a separate vessel, which is then removed from the main vessel. The good news is that bleeding a clutch is a straightforward procedure. We’ll show you how to use a pressure bleeder since you’ll be able to do the task without the assistance of a second person.

The Tools You’ll Need

In order to complete this project, you’ll need a few tools, which are listed below:

  1. A pressure bleeder is used to relieve pressure. It is advisable to use clear tube for the bleeder valve since it is transparent. Flexible hose or tubing that will fit snugly on the valve. The liquids should be collected in a cup or container. Jacks and jack stands are included. A wrench that is designed to fit the bleed valve. (These might be tiny in size.)

If you work on your car on a regular basis, a pressure bleeder (also known as a vacuum bleeder) that costs $50 or more may be an useful purchase. Additionally, it may be used to bleed the brakes.

The Steps To Take

In order to bleed your clutch, perform the following procedures:

  1. Lift the front end of the vehicle
  2. To do so, open the hood. Remove the cover from the reservoir containing the clutch fluid. Check to see that the reservoir is entirely filled to the top of the line. Attach the pressure bleeder to the top of the reservoir with a screwdriver. Pump the clutch pedal a couple of times. If you’re using a power bleeder, keep an eye on the gauge and pump it up to roughly 12 PSI. Take the following materials and place them beneath the car before continuing:
  1. Locate the slave cylinder for the clutch and the bleed valve for the clutch. If it is rusted, spray it with penetrating oil to restore its luster. Check to see that you can turn the bleed valve. Place the hose over the bleed valve and get the cup ready to catch any fluid that may have accumulated. Crack the bleeder valve open approximately a quarter of a turn with the wrench, making sure to hang onto the hose. Begin keeping an eye out for fluid and air bubbles. Wait for the air bubbles to subside before continuing. When they have come to a halt, tighten the valve and remove the tube from the machine. You should have only lost a little amount of fluid, but you should still fill the reservoir to the brim. Check the clutch’s performance. It should feel tighter and easier to engage as a result of this. Alternatively, if the spongy pedal returns rapidly, a new clutch master cylinder or slave cylinder may be required.

Bleeding the brakes is just as simple using a vacuum bleeder, if not easier. If you have any more queries, please refer to your service manual or contact us directly. We are always willing to discuss brakes and clutches with you. Summary Title of the Article How To Bleed A Clutch (with Pictures)Description In practice, the presence of air in a clutch system generally results in short pedal throws and poor gear engagement and disengagement.

There are three options available to the motorist in order to resolve this dilemma. John Butler is the author of this book. Name of the publisher BrakesPublisher Logo can be purchased.

How to Bleed a Clutch Master Cylinder (in 7 Easy Steps)

(This page was last updated on July 17, 2020) The clutch master cylinder is a component that may be found in vehicles that have a manual gearbox. It’s important to remember that while stopping or changing speeds in a manual car, the driver must engage the clutch. The clutch master cylinder’s primary job is to provide hydraulic power, which is necessary for the clutch to work correctly. Brembo braking fluid is contained in the clutch master cylinder’s reservoir, which is simple to understand. There are hoses that link the clutch master cylinder to the clutch slave cylinder on the transmission.

This generates the hydraulic pressure required to engage the clutch and release the shafts of the engine and wheels from one another.

This indicates that you are allowing air to “bleed” from the cylinder.

Additionally, you’ll want extra hydraulic fluid to be easily available.

7 Steps to Bleed a Clutch Master Cylinder

The following are the measures to take in order to bleed the clutch master cylinder.

1) Prepare to Bleed the System

Find the clutch slave cylinder in your car, which is the first step in repairing your vehicle. In the event that you know the location of the clutch fork on your gearbox, the clutch slave cylinder should be connected to it. Following the discovery of the slave cylinder, look for the bleeder valve. This should have the appearance of a little nut on the end, which typically has a diameter of around 8mm. A rubber nipple is frequently used to cover the nut in order to keep dirt and debris out. If you are bleeding your engine, you should choose a tube that will fit over the end of the bleeder screw and produce a good seal.

Fill a drain pan, bucket, or other small container with water and place the other end of the tube in it.

2) Open the Bleeder Valve and Purge Air

In the interior of your car, ask your companion to apply firm pressure to the clutch pedal with their foot. Instruct them to depress the clutch pedal all the way down until it contacts the floor of the car. The slave cylinder bleeder valve will be loosening up when they are pressing down on the clutch pedal with a wrench (often an 8mm tool) while they are doing so. Continue to loosen the valve until air begins to escape. The hydraulic fluid should begin to “bleed” out a few moments after that, according to the manufacturer.

It should be noted that while bleeding the clutch and brakes, it is better to use a flare nut wrench. These wrenches are designed to cover as much surface area as possible on the bleeder screw in order to reduce the likelihood of stripping the nut during the installation process.

3) Close the Bleeder Valve

While the clutch pedal is still down, tighten the bleeder valve with the wrench to restore its original tightening torque. It is possible that releasing the clutch before the bleeder screw is tightened will cause air to be sucked back into the system. Once the bolt is tightened, have your spouse gradually release pressure from the clutch pedal until it returns to its normal position. Examine the master cylinder to see whether there is still enough fluid in it. Continue to add extra as required.

Examples include clutch lines, master cylinders, and slave cylinders, among others.

The majority of the parts will need to be replaced completely, although certain clutch master and slave cylinders can be rebuilt to save a little money on the overall cost.

4) Repeat Until No Air Remains

Steps 2 and 3 should be repeated. Request that your spouse apply hard pressure to the clutch pedal until it is flush with the floor once more if necessary. Loosen the valve with the wrench until air begins to seep through. Continue to repeat this cycle of air bleeding until there is no more air coming out and only fluid is pouring out as a result. At this stage, shut or tighten the bleeder valve as necessary.

5) Top Off Clutch Fluid Reservoir

Allow your companion to carefully depress the clutch pedal until it returns to its original position on the floor. Open the top of the brake fluid reservoir by removing the master cylinder from the vehicle. Take your spare hydraulic fluid and pour it into the reservoir until the fluid reaches the “Full” line on the reservoir’s indicator. Try not to fill the container to the point of overflowing.

6) Test Clutch Pedal

Now all you have to do is start the vehicle and step on the clutch pedal to see how it works. The clutch should have a solid grip on the car’s floor. Also, try shifting into different ratios to determine if they are smooth or slick. If they’re smooth, then everything is in working order at this point.

7) Clean Up

Clean your work space, as well as all of the equipment and containers that you have there. In the event that there is hydraulic fluid on any chrome trim or painted surfaces, you must clean it up as soon as possible since the fluid might harm the chrome and painted surfaces. For your viewing pleasure, here is an excellent video that demonstrates the procedure of bleeding a hydraulic clutch:

Bleeding the Hydraulic Clutch Actuation System

Our helpful hints give merely a high-level overview. You must follow the installation and operation instructions supplied by the vehicle manufacturer, as well as any warnings and safety precautions that are included in them! All work must be carried out by a properly qualified individual. The images featured in our suggestions, as well as the technique outlined in them, are illustrative only and may differ based on the vehicle manufacturer and axle design.

Preventing malfunctions of the clutch actuation system by bleeding it correctly

Despite the fact that the electrification of vehicle components is progressing at an inexorable pace – the electric power steering system is just one example – three components in particular continue to be actuated by hydraulic means: the brake, the hydraulic or electrohydraulic steering system, and the hydraulic clutch actuation system.

In order to work properly, all systems must be free of trapped air, which is something that all systems must have in common.

Air as cause of malfunction

Unlike liquids, air has the ability to be compressed. A major source of failure in the aforementioned vehicle systems is air. Because they operate on the hydraulic principle, in which power is delivered by a non-compressible liquid column, air is the primary cause of failure in these systems. When it comes to the hydraulic clutch, the following symptoms may manifest themselves:

  • Modifications to the pedal travel
  • Difficulties disengaging the clutch
  • Imperfect pedal feel
See also:  BMW overheats? (Professionals recommend)

Therefore, following clutch repairs or after replacing hydraulic components, hydraulic release systems must be bled in accordance with the vehicle manufacturer’s recommendations to ensure proper operation. Pumps for hydraulic clutch actuation systems with bleeders

The right tool

The appropriate workshop equipment must be accessible in order to complete this operation efficiently and successfully. The use of an appropriate bleeder is essential in this situation. Without the use of these equipment, bleeding the hydraulic clutch components is time-consuming and does not always achieve the intended results. Additionally, a collecting vessel for the hydraulic fluid will be required, along with a transparent tube that is designed to fit between the bleeder nipples. The use of a vacuum unit is common in bleeders, which helps to keep the fluid level in the compensating reservoir level at the end of the bleeding process.

Clutch actuation systems

All of the different clutch actuation methods are built on the concept of a master and slave cylinder. In response to the clutch pedal’s actuation, the slave cylinder uses the communicated power to mechanically release the clutch, and vice versa. The various components of the systems, on the other hand, are designed differently. The master cylinders are either equipped with a separate liquid reservoir or are fed via a line that runs from the compensating reservoir to the master cylinder. However, the slave cylinders are either basic pressure cylinders that are used to release the clutch system or concentric slave cylinders that are used directly on the clutch pressure plate to release the clutch.

Clutch actuation systems at a glance

Master cylinder with a reservoir for liquid There is no liquid reservoir in the master cylinder. As a basic pressure cylinder, the slave cylinder is used. CSC is an abbreviation for concentric slave cylinder.

Notes on the bleeding process

Following are some general observations on the bleeding process before it is broken down into distinct steps: 1. You should only utilize bleeders that have been approved by the vehicle’s manufacturer. In order to ensure that the hydraulic liquid flows freely throughout the bleeding process, make sure that the clutch pedal is fully retracted to the end position. 3. Keep an eye on the amount of fluid in the compensating reservoir at all times. 4. Maintain the lowest feasible level of bleeding pressure.

5. Do not operate the clutch pedal during the bleeding process, as this may result in excessive travel of the clutch pedal. It is possible that the hydraulic cylinder may be released too far, which would result in leaking.

Bleeding process in individual steps

Use only liquids that have been approved by the car manufacturer! When executing the bleeding procedure, make certain that everything is completely clean!

  • Ensure that you only use liquids that have been approved by the car manufacturer. When completing the bleeding procedure, make certain that the area is completely clean.

The Service Information 12404, Bleeding Types for Hydraulic Clutch Actuation Systems, provides more information on the numerous variants of fixed and twistable bleeder nipples.

  • Pressure should be released from the bleeder
  • Retain the master cylinder or compensatory reservoir while disconnecting the bleeder adapter
  • Check the fluid level in the compensating reservoir and make any required adjustments (pay attention to the MAX indication)
  • Reinstall the filling cap on the reservoir.

To perform a function test, depress and release the clutch pedal multiple times. The clutch pedal must always be able to return to its original position on its own.

Steps of the bleeding process

Empty the compensating reservoir by removing the filler cap. The slave cylinder is equipped with a bleeder nipple. Check the level of fluid in the reservoir. Master cylinder with a reservoir for liquid (right)

GM Concentric Slave Cylinder Bleed Procedure

It’s likely that if you’ve been working on clutches for a long, you’re familiar with the terrible Ford Ranger concentric slave cylinder, as well as the challenges and uncertainties that come with trying to bleed it. Unfortunately, General Motors has pursued a similar path with additional concentric slave cylinders in its product line-up. The majority of General Motors vehicle designs do not allow for access to the slave cylinder without first disconnecting the transmission from the engine and then removing the transmission.

  • This process is designed to aid you with bleeding these troublesome slaves.
  • *** 1.) Check to see that the clutch master cylinder is completely filled with fluid.
  • Inspect the firewall to ensure that the clutch master cylinder is installed level.
  • 3.)Connect the concentric slave cylinder to the transmission and engage it.
  • (Figure 1) This seal MUST be greased at all times!
  • Four.) Raise and secure the transmission into the car, but do not attach it to the engine.
  • The slave cylinder should be returned to its bore in the bell housing (Figure 2) once the hydraulic line has been connected.
  • Then repeat the process 12–15 times more.

The bleeding has been completed. *** If you have a concentric slave cylinder application, this approach will work for you. The only way to bleed many contemporary applications that don’t have bleeder valves is to use this method. Schaeffer has provided a technical tip for you.

How to Bleed Your Clutch Hydraulics Without a Helper

Karl Bermann contributed to this article.


I recently completed a clutch master cylinder rebuild on my 1992 NA. Given the lack of available assistants to pump the clutch pedal or replenish the reservoir, I had to create a mechanism for accomplishing these tasks on my own. We were pleased with the results of the procedure given here.

Parts Needed:

A chunk of wood measuring 26 3/4″ in length. This can be a 1 x 2, a length of thick dowel, a piece of broom handle or molding, or anything else that is rigid enough to keep the clutch pedal firmly depressed in place. (It is possible that the length will need to be modified for later models.) A length of transparent plastic tubing approximately 24″ in length, with a diameter large enough to fit over the bleed nipple on the slave cylinder The piece I used had an internal diameter of 14 inches, but a piece with a smaller interior diameter might provide a more snug fit.

It is beneficial to have an 8mm box wrench with a closed end.


Since I wasn’t planning to remove the slave cylinder, I foundit easier to use a set of ramps under the front wheels and work under the carrather than jacking the car up and taking off the right front wheel. Put oneend of the plastic tubing on the end of the nipple, the other in the empty jar. When you have reassembled the clutch hydraulics, refill theclutch fluid reservoir, make sure the bleed nipple on the slave cylinder istightly closed. Now, with the piece of wood within reach, slowly depress theclutch pedal with your hand and hold it down while you prop the wood againstit, wedging the other end against the bolt that holds down the left front ofthe driver’s seat.

  • You may see some fluid, or just a puff of air, or perhaps some of both in theform of bubbles.
  • On your way backto the clutch pedal, check the fluid reservoir and top off as necessary.
  • When it is all the way up, press it down again slowly andreinsert the wood.
  • Repeat the entireprocess as many times as needed until you see a solid stream of clear brakefluid coming from the nipple with no air bubbles.
  • And don’t forget to check the fluid reservoir each time.
  • If it seems okay start the car and put it in gear (reverse if you’vegot it up on ramps).
  • If all isnot right, you’ve still got air in the system and will have to bleed itsome more.
  • Note: When I did mine, I had let the system drain so I couldflush out dirty fluid.

The first couple of times I opened the bleed nipple,therefore, I pumped the clutch pedal three times in order to make the processgo a little faster, because I knew that the first couple of times all I’dbe doing was compressing air.

Note from Jason:

The fact that I have changed both my master and slave cylinders on my car has led me to the conclusion that you do not need to open and close the bleed valve. Because of the placement of the slave cylinder, gravity is used to complete the task at hand. Simply release the slave nipple and allow the fluid to drain until there is no more air in the system. It is possible that you will need to pump once or twice, but once the fluid begins to circulate, it will function on its own. Finish with a little tightening and nipping.

Another method from Gus Harris

I recently got my second Miata (2000, my first being a 1990), and it was quickly discovered that the clutch slave cylinder/master cylinder needed to be changed. Instead of changing one and then having to go back and perhaps replace the other, I just changed them both, and I’d recommend it to anyone who is having problems figuring out which component is causing problems. The only thing that made me hesitant about performing this surgery myself was the bleeding. However, after viewing a YouTube video created by someone else, I discovered a terrific and simple method for efficiently bleeding the system following the installation of the slave cylinder, master cylinder, or both of these components.

  • So, here is my explanation of how to perform this one-person bleeding procedure in a quick, easy, and successful manner.
  • There are a variety of strategies for accomplishing this, and these methods may be easily obtained by conducting a web search for how to perform bench bleeding for both the master and slave cylinders.
  • The primary goal is to remove some of the air and some of the fluid from both sections prior to installation, as this will make the final bleeding much simpler.
  • Using this method takes only a few minutes and works flawlessly.
  • For lubricating items, a tiny “oiler pump” such as you can find at most auto parts stores would suffice.
  • Even though they have relatively small reservoirs, they will be sufficient in size to contain enough brake fluid to completely fill your system and have enough left over for other uses.
  • Following bench bleed and installation of the components, fill the pump oiler with fresh brake fluid.

Pump the oiler until the fluid in the plastic tubing has solidified and is flowing out the other end of the machine.

Then, fill the master cylinder reservoir with fresh fluid until it is approximately halfway full, leaving the top cover off.

Then, from where the slave cylinder is located in the wheel well, disconnect the end of the plastic tubing and fasten it to the bleeder valve using a ratchet or other suitable tool.

After that, you’ll be ready to begin the bleeding procedure.

This is simple to perform since air naturally wants to rise up from the system rather than fall down as most people attempt to pump it.

Then you simply lean over the fender and pump the oiler while keeping an eye on the fluid as it drains into the slave cylinder and looking over at the master cylinder reservoir for air escaping as fluid and air bubbles are drawn up into the reservoir as the fluid and air bubbles are drawn up into the reservoir.

You will ultimately begin to witness air bubbles rise up through the reservoir (ensure that the reservoir cover is removed) and exit the system at some point throughout the process.

Once the fluid level has risen above the full mark, stop pumping and drain the fluid from the master cylinder reservoir (using suction or whatever method is necessary to remove it), but leave enough fluid in the reservoir (again, approximately halfway to the full mark) to prevent air from re-entering the vehicle.

Continue the pumping method as it is currently set up.

On the last pumping, proceed to pump enough fluid into the reservoir to bring it up to the maximum level shown on the gauge.

When you get inside the automobile, you should notice that the clutch pedal is lovely and strong!

Then you just need to unhook it from the bleeder valve and remove it from the engine compartment without spilling any fluid on the fender or engine parts.

This entire procedure should take you no more than 30 minutes to complete. It is the most successful bleeding treatment I have ever used, and it can be completed by one person without the need for any further assistance!

Leave a Comment

Your email address will not be published. Required fields are marked *