34 21 320 Removing and installing/replacing both brake discs
Special tools required:
- 34 1 280
Necessary preliminary work:
- Remove and clean the BRAKE PADS .
Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure.
- Compare measuring result and lowest value with setpoint value, refer to:REAR BRAKE DISCS SPECIFICATIONS .
If the brake discs are replaced, you must also fit new brake pads.
Always replace brake discs in pairs.
Attention!
New brake pads may only be installed if the brake disk thickness is greater than the minimum brake disc thickness, refer to:REAR BRAKE DISCS SPECIFICATIONS .
Release bolts (1) and detach caliper carrier.
Installation note:
Replace screws.
Tightening torque, refer to:34 21 2AZ.
Attention!
To release brake disc: Do not under any circumstances strike friction ring with a hammer or similar!
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!
Release screw (1) and remove brake disc (2).
Installation note:
Replace screw.
Tightening torque, refer to: 34 21 1AZ.
After installation:
- Refer to: ADJUSTING PARKING BRAKE
- Read and comply with NOTES ON BREAKING IN NEW BRAKE DISCS/BRAKE PADS.