Failure to disengage the clutch pedal (i.e., the clutch will not disengage) can be caused by a variety of reasons. The following are some common causes and their corresponding solutions:

1、Clutch pedal free travel problem

Cause: The free travel of the clutch pedal is the key to ensuring that the clutch can be fully disengaged. The free travel of the clutch pedal is too large, resulting in the shortening of the travel of the release bearing to push the release lever forward and the shortening of the travel of the pressure plate to the rear, and the clutch cannot be fully disengaged.

Solution: Adjust the size of the free travel of the pedal to ensure that it is within a reasonable range.

2、Double disc clutch adjustment problem

Reason: In double-disc clutch, the distance between the adjusting screw and the center active disk is too small, resulting in insufficient backward movement of the center active disk, which does not completely separate from the front friction plate.

Solution: Adjust the distance between the adjusting screw and the middle active disk to ensure that the middle active disk can be fully moved back.

3、Front pressure plate spring problem

Reason: the length and stiffness of the front pressure plate spring is different or damaged, the depth of the spring hole is not consistent, the inner and outer clutch plate assembly is bent, or the rivets are loose.

Solution: Replace the front pressure plate spring and check whether other related parts are damaged or loose.

4, hydraulic system problems

Reason: improper adjustment of the clearance between the hydraulic cylinder piston and the hydraulic maneuvering clutch push rod, or insufficient brake fluid in the clutch oil housing, air in the oil circuit or insufficient oil.

Hydraulic clutch system, if the hydraulic oil leakage, oil pipe blockage or oil pump damage, may lead to the clutch pedal can not work properly. Hydraulic fluid leakage will cause a drop in system pressure, making clutch disengagement incomplete; a clogged line will impede the flow of hydraulic fluid, affecting the normal operation of the clutch; a damaged pump will not provide enough pressure to push the release bearing.

Solution: Re-adjust the clearance between the hydraulic cylinder piston and the hydraulically operated clutch push rod, add brake fluid to the specified level, and remove the air from the oil circuit.

5, clutch sub-pump or master cylinder problem

Reason: clutch sub-pump or clutch master cylinder has oil leakage phenomenon, resulting in insufficient pressure in the hydraulic system.

Solution: Replace the leaking clutch sub-pump or clutch master cylinder, and check the sealing of the entire hydraulic system.

6, the separation lever problem

Reason: the release lever is not in the same plane, or the release lever bracket bolt is loose.

Solution: Check whether the height of the inner end of the release lever is the same, adjust or tighten the bracket bolts to ensure that the release lever is in the same plane.

7、Clutch plate wear problem

Cause: The clutch plate is badly worn, exposing the rivets, causing it to slip with the clutch disk at high temperatures, which in turn affects clutch disengagement. Worn or abraded clutch plates may not be able to form effective friction contact with the flywheel, thus affecting the normal operation of the clutch pedal.

Solution: Replace the clutch disc with a new one and check if other related parts are badly worn.

8、Follower disk problem

Cause: The steel plate of the driven disk is seriously deformed, resulting in the clutch not being able to disengage properly.

Solution: Replace the slave disk and check whether other related parts are damaged.

9. Clutch Release Bearing Stuck or Damaged: The release bearing pushes the clutch pressure plate when the clutch pedal is pressed to separate the clutch disc from the flywheel. If the release bearing is stalled or damaged, it may not be able to push the pressure plate properly, resulting in the clutch pedal not disengaging.

10. Clutch Pedal Mechanical Connection Problems: In a mechanical clutch system, the clutch pedal is connected to the release bearing by a cable or linkage. If the cable or linkage is broken, loose or stuck, the clutch pedal may not disengage properly.

11. Leaking oil, air or fuel from the clutch hydraulic operating mechanism: Oil seals, lines or pump bodies in the clutch hydraulic system may leak due to wear or damage, preventing the clutch from operating properly.

12. Clutch pedal stuck: The clutch pedal may be stuck by a foreign object, or there may be a mechanical problem with the pedal itself, such as a broken pedal shaft or deformed pedal bracket, resulting in the pedal not moving properly.

13. Clutch hydraulic system air entry: If air is mixed in the hydraulic system, it will lead to unstable system pressure and affect the normal operation of the clutch pedal.

14. Failure of the clutch pedal return spring: The clutch pedal is usually equipped with a return spring to ensure that the pedal can quickly return to its initial position after release. If the return spring is damaged or loses its elasticity, the pedal may not return to its original position properly, affecting clutch disengagement.

15. Other Possible Causes

The clutch may not disengage if the center pressure plate is installed backwards, or if the release spring is too soft or broken. In this case, it is necessary to check and adjust or replace the relevant parts.

To summarize, there are various reasons why the clutch pedal fails to disengage, which need to be investigated and solved according to the specific situation.

When you encounter the problem of the clutch pedal failing to disengage, you should immediately inspect the clutch system, including the hydraulic system, pedal free travel, release bearing, pressure plate spring, clutch plate and other components to determine the specific cause. If necessary, you should seek the help of a professional technician to repair or replace the defective parts to ensure the safe operation of your vehicle.