Removing and Installing/Replacing Both Brake Discs (Rear)

34 21 320 - Removing and installing/replacing both brake discs





Special tools required:
- 34 1 280 34 1 280 Sliding Caliper





Necessary preliminary tasks:
- Remove wheels Removing or Installing Front or Rear Wheel
- Remove and clean brake pads Removing and Installing/Replacing Brake Pads on Both Rear Disc Brakes





Check minimum brake disc thickness:
- Position special tool 34 1 280 34 1 280 Sliding Caliper at three measuring points in area (1) and measure.
- Compare measurement result and lowest value with setpoint value [1][2]34 21 Rear Brake.
If the brake discs are replaced, you must also fit new brake pads.
Brake discs may only be replaced in pairs (on each axle).





Important!
New brake pads may only be installed if the brake disc thickness is greater than or equal to the minimum brake disc thickness [1][2]34 21 Rear Brake (MIN TH) (not incl. M vehicles).
In the case of M vehicles and perforated brake discs, new brake pads may only be installed if the brake disc thickness is greater than the minimum brake disc thickness [1][2]34 21 Rear Brake (MIN TH).

Note:
The minimum brake disc thickness is configured in such a way that it lasts the life of a further set of brake pads (does not apply to M vehicles and perforated brake discs).





Release screws (1). Remove brake anchor plate in direction of arrow.

Installation:
Replace screws.
Tightening torque 34 21 03AZ 34 21 Rear Brake.





Unscrew bolts and take off brake disc.

Installation:
Replace brake disc retaining screw.
Tightening torque 34 21 1AZ 34 21 Rear Brake.





After completing work, read and comply with notes on braking in new brake discs / brake pads Procedures.
Adjust parking brake Adjustments.