34 21 200 Removing and installing or replacing brake pads on both rear disc brakes (Teves floating caliper)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

34 1 050
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 . See WHEELS .
Remove brake pad wear sensor

Lift out retaining spring (1).

Fig 1: Lifting Out Retaining Spring

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Remove cover plug (1).

Fig 2: Identifying Cover Plug

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IMPORTANT: Tie brake caliper back and do not allow to hang from brake hose.

Unscrew guide bolts (1).

Remove brake caliper (2) by pulling forward.

Installation:

Tightening torque, see 34 21 REAR BRAKE .

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Fig 3: Identifying Brake Caliper And Guide Bolts

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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.
In the event of one-sided brake pad wear, do not change brake pads round.

Clean brake pads.

Do not grease backs of brake pads sleeve.

Fig 4: Removing Outer Brake Pad

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IMPORTANT: When pressing down piston, note brake fluid level in expansion tank.
Overflowing brake fluid will damage the paintwork.

Turn piston fully back with special tool 34 1 050 .

Fig 5: Identifying Special Tool (34 1 050)

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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.

Fig 6: Measuring Minimum Brake Disc Thickness
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IMPORTANT: New brake pads may only be installed if the brake disc thickness is greater than or equal to the minimum brake disc thickness (MIN TH) (not incl. M vehicles).
In the case of M vehicles and perforated brake discs, new brake pads may only be installed if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH).

See BRAKES - TECHNICAL DATA .

NOTE: The minimum brake disc thickness is configured in such a way that it lasts the life of a further set of brake pads (does not apply to M vehicles and perforated brake discs).

Check dust sleeve (1) for damage and replace if necessary.

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

Clean contact face (2) of brake piston and apply a thin coating of anti-squeak compound.

Fig 7: Identifying Dust Sleeve

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

Fig 8: Identifying Contact Faces Of Brake Pad

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Clean contact face (1) of brake caliper and apply a thin coating of anti-squeak compound.

Fig 9: Identifying Contact Face Of Brake Caliper

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Clean brake caliper holder at hammerhead guides (1) and apply a thin coating of anti-squeak compound.

Fig 10: Identifying Hammer Head Guides

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NOTE: After completing work:

Fully depress brake pedal several times so that brake pads 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 braking in new brake discs / brake pads .
When replacing pads, reset CBS display in accordance with factory specification.