34 21 200 Removing and installing/replacing both rear brake pads of disc brake

Special tools required:

34 1 050
34 1 280
2 352 960

CAUTION:

Brake pad wear sensor: After removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
Retaining pin and expanding spring: for vehicles older than 48 months it is recommended to replace the retaining spring!

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket, but rather clean with brake cleaner BMW TI. number 83 19 2 154 780 and apply a thin coating of break pad paste BMW TI. number 83 19 2 158 851 (3 gr.) or 83 19 2 158 852 (100 gr.).
Spread brake pad paste onto the marked surfaces using a brush!
Observe REGULATION ON APPLYING BRAKE PAD PASTE TO BRAKE PADS AND BRAKE ANCHOR PLATES !

Necessary preliminary work:

Remove the WHEELS .
Remove the BRAKE PAD WEAR SENSOR .

Lift out retaining spring (1).

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Remove cover plug (1).

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CAUTION: 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 note:

Tightening torque, refer to: 34 21 4AZ.

Clean guide screws only; do not grease.

Check thread.

Replace all guide screws which are not in perfect condition.

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Installation note:

When putting on the brake caliper, it is absolutely necessary to make sure that the T-head (1) of the outer brake pad is seated correctly on the contact surface (2).

CAUTION: With brake pads that are already partially worn, pay particular attention that the position of the outer brake pad in relation to the contact surface (2) is ensured!

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Remove outer brake pad.

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

CAUTION: 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.

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Press back brake pads and piston with special tool 2 352 960.

CAUTION: When forcing piston back:

Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paintwork.

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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 measuring result and lowest value with setpoint value, refer to: REAR BRAKE DISCS SPECIFICATIONS .

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CAUTION: New brake pads may only be installed if the brake disk thickness is greater than the minimum brake disc thickness, refer to REAR BRAKE DISCS SPECIFICATIONS .

CAUTION: If new brake pads are mounted on a brake disc, the following must be observed:

Bevel edges in the area (1) slightly (dimension A must not exceed maximum 1 mm).

These procedures applies for all the following described brake systems.

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Check dust boot for damage and replace if necessary.

Clean contact surface (1) of brake piston with brake cleaner and apply a thin coating of brake pad paste.

CAUTION: Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.

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Clean contact surfaces (1) of T-head/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.

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Clean contact surface (1) of brake caliper with brake cleaner and apply a thin coating of brake pad paste.

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So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1) for the brake pads on the brake caliper mounting bracket. Clean guide surfaces (1 and 2) with brake cleaner and apply a thin coating of brake pad paste.

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So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1 and 2) for the brake pads on the brake caliper mounting bracket. Clean guide surfaces (1 and 2) with brake cleaner and apply a thin coating of brake pad paste.

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Apply a thin coating of brake pad paste to T-head of inner brake pad in area (1) and (2).

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Apply a thin coating of brake pad paste to T-head of outer brake pad in area (1) and (2).

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NOTE: After completing repair 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 breaking in new brake discs/brake pads. Read and comply with NOTES ON BREAKING IN NEW BRAKE DISCS/BRAKE PADS.
When exchanging brake pads, reset CBS display in accordance with factory specification.