Why is there a knocking sound when releasing the clutch pedal quickly?
2 Answers
A knocking sound at the moment of clutch engagement is caused by transmission linkage jamming, which makes the pressure plate suddenly press against the driven plate resulting in jerking, or by a deformed driven plate or oil-contaminated friction lining, leading to abrupt clutch engagement and impact. It is recommended to have it checked at a 4S shop. Below is relevant information: Automobile Clutch: The automobile clutch is the control device of the manual transmission clutch assembly. Its correct operation directly affects the vehicle's starting, gear shifting, and reversing. Automobile Clutch Operation Method: The clutch pedal release follows the principle of "two fast, two slow, and one pause." Poor coordination between the clutch and throttle during vehicle starting can cause the engine to stall or the car to shake when starting.
I've been driving for over a decade and have encountered the issue of clutch engagement noise several times. The main reasons are usually worn or deformed clutch discs, especially when releasing too quickly with excessive force, causing internal components to vibrate and make noise. Loose transmission gears or bearings can also cause this problem, such as aging release bearings or uneven flywheel surfaces. I recommend first checking if the clutch pedal operates smoothly yourself. If it feels sticky, it's definitely time to visit a repair shop. When driving, try to engage the clutch gently - avoid sudden stomping or releasing, as this accelerates component wear. Replacing parts isn't too expensive, and timely repairs can prevent bigger issues. Driving safety is too important to ignore such abnormal noises.
