To know if the hydraulic clutch is bad, you can judge by checking and observing the following aspects:

First, the clutch pedal feels abnormal

Heavy pedal: If the clutch pedal feels abnormally heavy when pressed, there may be a leak or insufficient pressure in the hydraulic system, resulting in the clutch not working properly.

Poor pedal return: release the clutch pedal, if the pedal can not quickly and completely back, may be the return spring failure or obstruction in the hydraulic line.

Soft or Empty Pedal: If the clutch pedal feels “soft” or “empty”, this may be due to air or leaks in the hydraulic system, resulting in insufficient pressure.

Pedal stroke changes: If the pedal stroke suddenly becomes longer or shorter, it may indicate a fault within the hydraulic system.

Second, the clutch engagement and disengagement performance decline

Slipping phenomenon: in the starting or accelerating, if the clutch slipping phenomenon, that is, the engine speed increases but the speed increase is slow, and even accompanied by a burnt flavor or smoke, this may be due to the clutch plate wear serious or hydraulic system pressure is not enough to lead to.

Incomplete disengagement: When shifting gears, if the clutch fails to disengage completely, resulting in difficulty in shifting gears or engine stalling, this may be due to hydraulic system failure, clutch plate wear or clutch pressure plate failure.

Clutch can not be fully engaged: If the vehicle accelerates unevenly or jerks when the clutch pedal is released, this may be due to the hydraulic system not being able to fully release the pressure, resulting in the clutch plate not being fully engaged.

Third, the hydraulic system check

Check the hydraulic pipeline: check whether the hydraulic pipeline has leakage, aging or wear phenomenon. If leaks are found, the relevant parts should be repaired or replaced in time.

Check the hydraulic oil: check whether the clutch hydraulic system fluid is sufficient and clean. If the oil is insufficient or seriously contaminated, it should be replenished or replaced with new oil in time.

   - Low oil level: If the hydraulic oil level is found to be lower than normal, this may indicate that there is a leak in the hydraulic system and that the master or slave cylinder may be faulty.

   - Deterioration of oil quality: If the hydraulic oil becomes darker in color or has impurities, it may mean that the oil is aging or the internal parts are worn out and need to be replaced.

Test hydraulic system pressure: Use a professional tool to test whether the pressure of the hydraulic system is within the normal range. If the pressure is insufficient, the hydraulic pump may be damaged or there may be a blockage in the hydraulic lines.

   - Air Venting: Perform an air vent of the hydraulic system to remove air from the system. If you find a large number of air bubbles during the venting process or if you are unable to completely remove the air, it may indicate a leak or malfunction in the system.

   - Check for leaks: Check for leaks at all connections and seals in the hydraulic system, including master cylinders, slave cylinders, lines and fittings.

IV. Other Inspections

Check Clutch Plate: If conditions permit, check the clutch plate for wear. If the clutch plate is badly worn, it should be replaced with a new one in time.

Check the clutch pressure plate: the clutch pressure plate is also an important part that affects the performance of the clutch. If the pressure plate fails or is deformed, it will cause the clutch not to work properly.

 V. Noise or vibration

   - Abnormal Noise: If you hear an abnormal noise, such as a hissing or knocking sound, when depressing or releasing the clutch pedal, it may indicate a malfunction within the hydraulic system.

   - Vibration: If you feel abnormal vibration when using the clutch, it may be due to damaged or worn components in the hydraulic system.

VI. Professional Diagnosis

If the above checks cannot determine whether the hydraulic clutch is damaged or you are not familiar with the structure and working principle of the clutch system, it is recommended that you send your vehicle to a professional auto repair store for diagnosis and repair. A professional mechanic can accurately determine the malfunction of the clutch system through professional equipment and experience, and take appropriate repair measures.

With the above signs and test methods, you can initially determine whether the hydraulic clutch is damaged. However, for complex problems, it is advisable to seek professional help to ensure accurate diagnosis and appropriate repair measures.