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

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

34 1 050
34 1 080
34 1 280 . See BRAKES - SPECIAL TOOLS .

IMPORTANT: The brake pad wear sensor must be replaced once it has been removed (brake pad wear sensor loses its retention capability in the brake pad).

Necessary preliminary tasks:

Remove wheels
Remove brake pad wear sensor

Observe safety instructions on raising the vehicle. See 00...... LIFTING VEHICLE WITH A LIFTING PLATFORM .

Remove plastic plugs (1).

Right side:

Disconnect plug connection for brake lining wear sensor.

Fig 1: Identifying 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 34 21 5AZ. See 34 21 REAR BRAKE .

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

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Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: Locating 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 Fully Back With Special Tool (34 1 050)
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Remove outer brake pad.

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

IMPORTANT: Mark any worn brake pads.

If the brake linings are worn on one side, they must not be mixed up!

Observe minimum thickness of brake pads. See BRAKES - TECHNICAL DATA .

Clean brake pads.

Do not apply grease to brake pad backplate.

Fig 5: Removing Outer Brake Pad

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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.

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).

Fig 6: Positioning 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 And Contact Face

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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: Identifying Mounting Faces

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

Fig 9: Identifying Mounting Faces

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

Fig 10: Locating Brake Caliper Holder

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NOTE: After completing work:

Fully depress brake pedal several times so that brake linings contact brake discs.
When installing new brake pads at front and rear axles, brake fluid level must be brought up to "MAX" marking.
Read and comply with notes on breaking in new brake discs / brake pads.
If necessary, when replacing linings, reset CBS display in accordance with factory specification.

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.