BMW 525Li makes a harsh sound when releasing the handbrake

BMW 525Li chassis F18 2013 model 2.0T displacement
Fault phenomenon:
The customer reported that there is a harsh sound when releasing the handbrake. After picking up the car and verifying the fault phenomenon, it is indeed a harsh sound when pulling the handbrake. The preliminary judgment is that the abnormal noise is caused by the wear of the motor
Fault phenomenon Fault phenomenon
Fault analysis:
Unplug the handbrake motor plug, loosen the two T30 screws at the back, and you can remove the motor. Install a new motor, pull up the handbrake, and you can still hear the harsh sound. Now the only things that are affected are the brake cylinder and brake oil. The brake pads are also very thin. It is also recommended that customers replace them. Use the computer to enter the special function, release the handbrake, follow the prompts, and you can hear the sound of the motor working. Use a flat-blade screwdriver to push it in, install the brake pads, and reset the brake pads. The last step is to refill the brake oil, drain it, and try to pull the handbrake. The sound is not so harsh, and the fault is solved
Solution:
Replace the motor, brake pads, and brake oil