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

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Special tools required:

34 1 050
34 1 080
34 1 280

Necessary preliminary tasks:

Remove wheels See 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL

Observe safety when raising the vehicle.

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.
Read and comply with notes on braking in new brake discs/brake pads . See 34 00 ... GENERAL INFORMATION ON BRAKING IN NEW BRAKE DISCS/BRAKE PADS

IMPORTANT:

On the E60 M5 and E63 M6 the fault memory entry "Mastervac vacuum pressure sensor" may be stored after the brake linings have been replaced.

The fault memory entry must be deleted. The vacuum pressure sensor only has to be replaced if the fault is entered repeatedly.

Remove plastic plugs (1).

Right side:

Disconnect plug connection for brake lining wear sensor.

If necessary, replace brake lining wear sensor. See 34 35 001 REPLACING A BRAKE LINING SENSOR

Fig 1: Identifying Plastic Plugs

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

Installation:

Only clean guide screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 21 5AZ. See 34 21 REAR BRAKE

Fig 2: Identifying Guide Screw

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Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: Identifying Retaining Spring

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Turn piston fully back with special tool 34 1 050 . See 34 1 050 FIXTURE

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 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. See 34 21 REAR BRAKE/DISK BRAKE E65

Clean brake linings.

Do not apply grease to brake pad backplate.

Fig 5: Locating Minimum Thickness Of Brake Linings

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Check minimum brake disc thickness:

Position special tool 34 1 280 at three measuring points in area (1) and measure. See 34 1 280 SLIDING CALIPER
Compare measurement result and lowest value with setpoint value. See 34 21 REAR BRAKE/DISK BRAKE E65

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). See 34 21 REAR BRAKE/DISK BRAKE E65

Fig 6: Identifying Special Tool (34 1 280)

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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.

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

Fig 7: Identifying Dust Sleeve With Contact Face

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

Fig 8: Identifying 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

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

Fig 10: Identifying 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. See

Fig 11: Locating Brake Caliper Holder

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