If a metal knock is heard in the rear wheel of the Mercedes Benz Class (W204), the problem is likely to be related to the parking brake plate. To correct the knock, you can do the following:
- Lift the car and take the wheel off.
- The parking brake drum.
- We find the plate to which the parking brake cable is attached.
- We clean and degreasing the places indicated by the arrows.
- Laying a leak in the same places.
- We collect all the reverse-knock.
- Checking the parking brake.
