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

Special tools required:

NOTE: After completing work:

Fully depress brake pedal several times so that brake linings contact brake disks.
When installing new brake linings at front and rear axles, brake fluid level must be brought up to "MAX" marking.
Hold ignition key for at least 30 seconds in position "1" without starting engine.
This clears a fault entry in the RAM

This prevents the brake wear indicator lamp from lighting up again.

Remove wheels.

Remove plastic plugs (1).

Right side:

Disconnect plug connection for brake lining wear sensor.

If necessary, replace brake lining wear sensor.

Fig 1: Identifying Plastic Plugs

Release guide screws (2) with special tool 34 1 080.

Installation:

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 21 5AZ.

Fig 2: Identifying Guide Screws

Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: Identifying Retaining Spring

Turn piston fully back with special tool 34 1 050.

IMPORTANT: When forcing piston back:

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

Fig 4: Turning Piston Fully Back

Remove 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!

Fig 5: Identifying Inner Brake Lining Located With Spring In Piston
New brake linings may only be installed if the brake disk thickness is greater than or equal to the minimum brake disk thickness (MIN TH).
Observe minimum thickness of brake linings,
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.
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 6: Identifying Dust Sleeve & Contact Face Of Brake Piston

IMPORTANT: In E39/Touring models, make sure the insulating ring (1) is installed on the brake piston.

Fig 7: Identifying Insulating Ring

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

Anti-squeak compound.

Fig 8: 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.

Anti-squeak compound.

Fig 9: Identifying Contact Face Of Brake Caliper

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

Anti-squeak compound.

Fig 10: Identifying Brake Caliper Mounting Bracket At Hammer Head Guides