34 11 220 Removing and Installing/Replacing Both Front Brake Discs
Special tools required:
- 34 1 280. See 34 1 280 SLIDING CALIPER
Necessary preliminary tasks:
- Remove front wheels. See 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .
- Remove and clean brake pads. See 34 11 000 Removing and Installing/Replacing Brake Linings On Both Front Disc Brakes .
After completing work, read and comply with notes on braking in new brake discs / brake pads.
Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure. See 34 1 280 SLIDING CALIPER
- Compare measurement result and lowest value with setpoint value. See 34 11 FRONT BRAKE E70
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). See 34 11 FRONT 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).
Release screws (1) and remove brake caliper mounting bracket.
Installation:
Tightening torque, see 34 11 2AZ in 34 11 FRONT BRAKE
Brake hose remains connected.
Check that brake hose is correctly seated in holder.
Release screw (1) and remove brake disc (2).
If necessary, carefully tap on base of brake disc chamber with a rubber mallet.
Clean contact surface of brake disc at wheel hub thoroughly and remove traces of corrosion.
Unevenness on contact surface may result in distortion of brake disc!
Installation:
Replace screw.
Tightening torque, see 34 11 2AZ in 34 11 FRONT BRAKE .