34 21 200 Removing and installing or replacing brake linings on both rear disk brakes: Installation:

Only clean guide screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque, refer to 34 21 5AZ REAR BRAKE .

Lift out retaining spring (3).

Fig 1: Lifting Out Retaining Spring

Withdraw brake caliper backwards.

Turn piston fully back with special tool 34 1 050.

Fig 2: Turning Piston Fully Back With Special Tool

IMPORTANT: When forcing piston back:

Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paintwork.

Remove outer brake lining.

Fig 3: Removing Outer Brake Lining

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

IMPORTANT: 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 disc thickness is greater than or equal to the minimum brake disc thickness (MIN TH). Refer to FRONT BRAKES . Observe minimum thickness of brake linings, refer to REAR BRAKES . Clean brake linings. Do not apply grease to brake pad backplate.

Check dust sleeve (1) for damage and replace if necessary.

Clean contact face (2) of brake piston and apply a thin coating of anti-squeak compound.

IMPORTANT: Dust sleeve must not come into contact with anti-squeak compound as this may cause the dust sleeve to swell.

Fig 4: Checking Dust Sleeve

Clean mounting faces (1) and (2) of brake lining hammer heads/brake caliper housing and coat with anti-squeak compound.

Fig 5: Identifying Mounting Faces Of Brake Lining Hammer Heads/Brake Caliper Housing

Clean contact face (3) of brake caliper and apply a thin coating of anti-squeak compound.

Fig 6: Cleaning Contact Face Of Brake Caliper

Clean brake caliper mounting bracket at hammer head guides and apply a thin coating of anti-squeak compound.

Fig 7: Cleaning Brake Caliper Mounting Bracket At Hammer Head Guides