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

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

34 1 050
34 1 080

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 disks.
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.

Fig 1: Removing Plastic Plugs

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

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

Fig 2: Releasing Guide Screws With Special Tool 34 1 080

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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 - 645CI .

Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: Removing Retaining Spring

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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!

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, refer to BRAKES - TECHNICAL DATA .

Clean brake linings, refer to 34 11 000 REMOVING AND INSTALLING/REPLACING BRAKE LININGS ON BOTH FRONT DISK BRAKES .

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.

Fig 5: Identifying Dust Sleeve And Contact Face (Rear Brake)

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Fig 6: Removing Outer Brake Lining

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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 7: Locating Insulating Ring Position In Piston

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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 8: Cleaning Brake Lining Hammer Heads/Brake Caliper Housing Mounting Face (Rear Brake)

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

Fig 9: Cleaning Brake Caliper Contact Face

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

Fig 10: Cleaning Brake Caliper Holder At Hammerhead Guides (Rear Brake)

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