34 11 220 Removing and installing/replacing both front brake discs
Special tools required:
Necessary preliminary tasks:
- Remove wheels
- IF NECESSARY, REMOVE AND CLEAN BRAKE PADS
After completing work, read and comply with notes on BREAKING IN NEW BRAKE DISCS / BRAKE PADS .
Observe SAFETY INSTRUCTIONS on raising the vehicle.
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 .
New brake pads may only be installed if the brake disc thickness is greater than or equal to the MINIMUM BRAKE DISC THICKNESS (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 (MIN TH).
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).
Always replace brake discs in pairs.
If the brake discs are replaced, you must also fit new brake pads.
Release screws (1), remove brake caliper and tie up.
Installation:
Tightening torque 34 11 2AZ .
If the brake hose was pulled from the mounting fixture during removal, make sure it is positively attached when installed!
Unscrew bolts and take off brake disc.
Installation:
Tightening torque 34 11 1AZ .
Clean contact surface of brake disc at wheel hub thoroughly and remove traces of corrosion if necessary. Unevenness on contact surface may result in distortion of brake disc!
Never remove or reposition balance clips.