Why is there a knocking sound when releasing the clutch after shifting gears?

[DeElias]

Clutch noise is relatively complex and difficult to accurately diagnose without an on-site inspection. First, the source of the noise should be identified. It is recommended to check whether the clutch pressure plate and release bearing produce noise due to issues such as excessive clearance or deformation when the pressure plate engages. For a more reliable diagnosis, it is advisable to visit a 4S dealership and have a technician test drive the vehicle. Below is additional information: 1. The function of a car clutch: To ensure smooth vehicle starting; to facilitate shifting between different transmission gears to adapt to changing driving conditions; to prevent overload in the drivetrain; and to significantly reduce torsional vibration impacts from the engine, thereby extending the lifespan of transmission gears. 2. A friction clutch should meet the following basic requirements: It must be capable of transmitting the maximum torque produced by the engine with some margin for additional torque. It should fully disengage when separated, engage smoothly, and have good heat dissipation capabilities. The rotational inertia of the driven parts should be as small as possible. This makes it easier to change the speed of the parts connected to the transmission input shaft when disengaging the clutch to shift gears, thereby reducing gear impact.