34 21 200 Removing And Installing Or Replacing Brake Linings On Both Rear Disc Brakes

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NOTE:

For Special Tool identification, see BRAKES - SPECIAL TOOLS .

Special Tools Required:

34 1 050
34 1 080
34 1 280

Necessary Preliminary Tasks:

Remove wheels. Refer to 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

Observe safety instructions on raising the vehicle. Refer to 00..... LIFTING VEHICLE WITH A LIFTING PLATFORM . If necessary, when replacing linings, reset CBS display in accordance with factory specification.

NOTE: After completing work:

Fully depress brake pedal several times so that brake linings contact brake discs.
When installing new brake linings at front and rear axles, brake fluid level must be brought up to "MAX" marking.

Remove plastic plugs (1).

Right side:

Disconnect plug connection for brake lining wear sensor. If necessary, replace brake lining wear sensor. Refer to 34 35 001 REPLACING A BRAKE LINING SENSOR .

Fig 1: Locating Plastic Plugs

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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. Tightening torque, refer to 34 21 5AZ in BRAKES - TIGHTENING TORQUES .

Fig 2: Identifying Guide Screws

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Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: View Of Retaining Spring On Brake Caliper

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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 Back With Special Tool 34 1 050
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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!

Observe minimum thickness of brake linings, refer to SPECIFICATIONS .

Clean brake linings.

Do not apply grease to brake pad backplate.

Fig 5: Removing Outer Brake Lining

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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. Refer to SPECIFICATIONS .

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 SPECIFICATIONS .

Fig 6: Identifying Measuring Points On Brake Disc

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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.

Fig 7: Locating Contact Face Of Brake Piston And Dust Sleeve

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

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

Fig 8: View Of Insulating Ring

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

Fig 9: Identifying Mounting Faces And Brake Lining Hammer Heads

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

Fig 10: Locating Contact Face Of Brake Caliper

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

Fig 11: View Of Brake Caliper Mounting Bracket

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