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

Special tools required:

34 1 050
34 1 280
2 285 574
2 365 377

Attention!

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 number 83 19 2 154 780 and apply a thin coating of brake pad paste BMW part number 83 19 2 158 851 (3 grey) or 83 19 2 158 852 (100 grey).
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 !
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!
A CBS reset must be done after every brake pad exchange.
- With a sanded brake pad wear sensor (display in CBS menu): CBS reset possible in vehicle.
- With a non-sanded brake pad wear sensor: CBS reset only possible via diagnosis system.

WARNING: During repair work on the rear brake, it must be ensured that the button for the electromechanical parking brake cannot be pressed!

Necessary preliminary work:

Remove the WHEELS .
Remove the BRAKE PAD WEAR SENSOR .

Removal:

Lift out retaining spring (1).

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Disconnect plug connection (1).

Detach cable from bracket (2).

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Remove cover plug (1).

Release guide screws.

Pull off brake caliper (2).

Attention!

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

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Install the brake caliper (1) with cable strap 2 413 317 .

Never leave the brake caliper (1) hanging on the brake caliper.

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Remove brake pads (1).

Attention!

Mark any worn brake pads.

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

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Installation:

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.

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Attention!

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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Place special tool 2 285 574, 2 365 377 on brake piston.

Use reversible ratchet (1) to turn back brake piston up to limit position.

Attention!

When pressing piston back, note brake fluid level in expansion tank.

Overflowing brake fluid will damage the paintwork.

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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.

Attention!

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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If necessary, clean brake pads.

Install brake pads (1).

NOTE: Brake pad with retaining springs (2) must be installed on the piston side.

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NOTE:

Clean guide screws only; do not grease.
Check thread.
Replace all guide screws which are not in perfect condition.

Mount brake caliper (2).

Insert guide bolts and tighten.

Tightening torque, refer to: 34 21 3AZ .

Install cover plug (1).

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Attention!

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

Above all, ensure the installation position of the outer brake pad to the contact surface (2) in brake pads that have worn out partially.

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Attach cable to bracket (2).

Position plug connection (1) and lock.

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Install the retaining spring (1)

Attention!

Ensure the retaining spring is fits securely.

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Required follow-up work:

Installing the brake pad wear sensor.
Install wheels at the rear.

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, the brake fluid level must be brought up to the "maximum" mark.
Read and comply with NOTES ON BREAKING IN NEW BRAKE DISCS/BRAKE PADS .
Switch on ignition and, using electrical parking brake operating element, open parking brake once, close once and open again.