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how to bleed a clutch


In most cases, the clutch can use brake fluid as its working fluid. When the steel pipe pile clutch is used, there will be a mechanical clutch, which means that it is operated by a lever, pivot point and linkage system, which converts the movement of the clutch pedal into the movement of the clutch pressure plate, thereby releasing the clutch.


Conditions for normal operation of the clutch.

How to use the clutch exhaust system?

What should be paid attention to when exhausting the clutch?


Conditions for normal operation of the clutch.

If the clutch slave cylinder or master cylinder is replaced, or the pipeline is replaced, or only the oil is replaced, sufficient work is required to exhaust air from the clutch, and then the clutch can work normally.


Most mechanics refer to this process as "draining" the clutch system, which is important because the air in the hydraulic system can cause it to malfunction. When the clutch pedal is depressed, the master cylinder presses hydraulic oil (brake fluid in this case) down the line into the slave cylinder. The fluid pressure will cause the slave cylinder to start, pushing the clutch fork and disengaging the clutch.


How to use the clutch exhaust system?

To expel air from the clutch system, you need to push or pull the air down through the fluid line to the bleed valve on the slave cylinder. To keep things clean, you should connect a tube to the nipple of the air release valve.


If a transparent tube is used, it is easy to see when all the air exits the system. The easiest way to drain the clutch is to use a vacuum pump to draw fluid and air out of the system while keeping the clutch reservoir full.


Continue to pump fluid from the relief valve until no more bubbles are seen in the fluid. If you don't have a vacuum pump, you can do it manually with a friend. With the bleed valve closed, ask your friend to depress the clutch pedal as much as possible.


What should be paid attention to when exhausting the clutch?

If there is air in the system, the air bubbles may compress. The compressed air bubbles will absorb most of the fluid transferred from the master cylinder to the slave cylinder, thereby preventing the slave cylinder from being actuated as far as possible, or even not actuated at all. If the slave cylinder does not travel as far as it can, the clutch will not be completely disengaged, making it difficult to shift the gearbox.

Open the bleed valve and let the fluid run out until it slows down while your friend maintains the pressure on the clutch pedal.

When the fluid flow slows down, and your friend is still stepping on the clutch pedal, close the bleed valve.

Let the clutch pedal retract and repeat the process.

Continue this process until no more bubbles can be seen leaving the relief valve.

When you finish this process, you should feel the pedal "harden" because the air compresses more easily than the clutch plate release spring.




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