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

WARNING: This page is about a different variant/trim than selected.

Special tools required:

IMPORTANT:

Brake pad wear sensor: after removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
Retaining pins 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. Instead, clean with brake cleaner BMW part no. 83 19 2 154 780 and apply a thin coating of brake pad paste BMW part no. 83 19 2 158 851 (3 g) or 83 19 2 158 852 (100 g).
Spread brake pad paste onto the marked surfaces using a brush!

Observe GUIDELINE FOR APPLYING BRAKE PAD PASTE ON BRAKE PADS AND BRAKE ANCHOR PLATE !

IMPORTANT: European version only.
Sport brake pads for M3:

Due to the increased strain on the brake discs, we recommend that you also replace the brake discs when fitting a new set of brake pads
It is absolutely essential to exchange the brake discs if cracked ≥ 13 mm even before the brake pad is worn

Necessary preliminary tasks

Remove WHEELS .
Remove BRAKE PAD WEAR SENSOR

Lift out retaining spring (1).

Fig 1: Lifting Retaining Spring

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Remove cover plug (1).

Fig 2: Identifying Brake Caliper 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 note:

Tightening torque 34 21 4AZ .

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Fig 3: Identifying Brake Caliper 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 back fully with special tool 34 1 050 .

Fig 5: Pressing Down Piston

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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 .

Fig 6: Checking Minimum Brake Disc Thickness
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IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the MINIMUM BRAKE DISC THICKNESS (MIN TH).

Check dust boot for damage and renew if necessary.

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

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

Fig 7: Identifying Brake Piston Contact Surface

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

Fig 8: Identifying T-Heads/Brake Caliper Housing Contact Surfaces

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

Fig 9: Identifying Brake Caliper Contact Surface

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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) with brake cleaner and apply a thin coating of brake pad paste.

Fig 10: Identifying Brake Pads Guide Surface

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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.

Fig 11: Identifying Brake Pads Guide Surfaces

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Lightly coat the T-head of the inner brake pad with brake pad paste in area (1 and 2).

Fig 12: Identifying Inner Brake Pad Paste Coating Area

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Lightly coat the T-head of the outer brake pad with brake pad paste in area (1 and 2).

Fig 13: Identifying Outer Brake Pad Paste Coating Area

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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 .
When replacing pads, reset CBS display in accordance with factory specification.