Replacing Both Rear Disk Brakes

Note:
When work has been completed, actuate brake pedal several times to ensure that brake pads make firm contact with brake disks.
When installing new brake linings on the rear axle and simultaneously replacing the brake linings on the front axle, check the brake-fluid level and top up to the "MAX" marking if necessary.
Remove wheels.





Remove seal plugs (1).
Right side: Disconnect plug connection for brake lining sensor.





Unscrew guide screws (2).
Installation: Only clean guide screws; do not grease.
Check threads.
Replace all guide screws which are not in perfect condition.
Tightening Torque.
Rear Guide Bolt
Wrench Size 7 mm 28 Nm





Lift out retaining spring (3).
Pull brake caliper backwards to remove.





Turn piston fully back with special tool 34 1 050.

Caution: When turning back the piston, watch the brake-fluid level in the expansion tank, as overflowing brake fluid will destroy the paintwork.





Remove outer brake lining.
Inner brake lining is located with its spring in the piston.

Caution: Mark any worn brake linings.

In the event of one-sided brake lining wear, do not change brake linings round.
New brake linings may only be installed if the brake disk thickness is greater than or equal to the minimum thickness (MIN TH).
Note minimum thickness of brake linings.
Clean brake linings.
Do not grease brake lining back plate.





Check dust sleeve (1) for damage and replace if necessary.
Clean contact surfaces (2) of brake piston and coat with a thin layer of anti-squeak compound.

Caution: Dust sleeve must not come into contact with anti-squeak compound as it may cause dust sleeve to expand.





Clean contact surfaces (1 - 2) of brake-lining tee heads/brake caliper housing and coat with anti-squeak compound.





Clean contact surfaces (3) of brake caliper and coat with a thin layer of anti-squeak compound.





Clean hammer head guides on brake caliper holders and coat with a thin layer of anti-squeak compound.