Removing and Installing Brake Linings on Both Rear Disk Brakes

Removing and Installing or Replacing Brake Linings on Both Rear Disk Brakes

Note:
After finishing work:
- Operate brake pedal several times to move brake linings against brake disks.
- When installing new brake linings on front and rear axles, you must top up the brake fluid level to the "MAX" mark.
- Hold ignition key for at least 30 seconds in position "1" without starting engine. This clears a fault entry in the RAM and prevents the brake wear warning lamp from lighting up again.
Remove wheels.





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





Release guide screws (2) with special tool 34 1 080.
Installation: Only clean guide screws; do not grease.
Check threads.
Replace all guide screws which are not in perfect condition.
- Guide Bolts Wrench Size 7 mm 28 Nm





Lift out retaining spring (3).
Withdraw brake caliper backwards.





Turn piston fully back with special tool 34 1 050.

Caution: When forcing piston back:
- Observe brake fluid level in supply tank. Overflowing brake fluid will damage the paint work.





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

Caution: Mark any worn brake linings.

If the brake linings are worn on one side, they must not be mixed up!
New brake linings may only be installed if the brake disk thickness is greater than or equal to the minimum thickness. Specifications
Note minimum thickness of brake linings.
Clean brake linings.
Do not apply grease to brake lining backplate.





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.





Caution: On E39/touring models, make sure the insulating ring (1) is installed on the brake piston.





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.