34 21 320 Removing And Installing Or Replacing Both Rear Brake Discs
For Special Tool identification, see BRAKES - SPECIAL TOOLS .
Special Tools Required:
- 34 1 280
Necessary Preliminary Tasks:
- Remove wheels. Refer to 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .
- If necessary, remove and clean brake linings. Refer to 34 11 000 REMOVING AND INSTALLING/REPLACING BRAKE LININGS ON BOTH FRONT DISC BRAKES .
E65 and E66: Release parking brake (pushbutton to left of steering wheel).
After completing tasks, adjust handbrake. Refer to 34 41 006 ADJUSTING PARKING BRAKE .
(Not for E65 and E66)!
Observe safety instructions on raising the vehicle. Refer to 00..... LIFTING VEHICLE WITH A LIFTING PLATFORM .
Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure.
- Compare measurement result and lowest value with setpoint value. Refer to SPECIFICATIONS .
New brake linings may only be installed if the brake disc thickness is greater than or equal to the minimum brake disc thickness (MIN TH). Refer to SPECIFICATIONS .
Always replace brake discs in pairs.
If the brake discs are replaced, you must also fit new brake linings.
Release screws (1), remove brake caliper and tie up.
Installation:
Tightening torque, refer to 34 21 3AZ in BRAKES - TIGHTENING TORQUES .
Unscrew bolts and take off brake disc.
Installation:
Tightening torque, refer to 34 21 1AZ in BRAKES - TIGHTENING TORQUES .
Clean contact surface of brake disc at wheel hub thoroughly; remove traces of corrosion if necessary. Unevenness on contact surface may result in distortion of brake disc!