34 21 200 Removing and installing or replacing brake pads on both rear disc brakes (TRW 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 REGULATION ON APPLYING BRAKE PAD PASTE TO BRAKE PADS AND BRAKE ANCHOR PLATES !

Necessary preliminary tasks

REMOVE WHEELS .
Remove rear BRAKE PAD WEAR SENSOR .

Release guide screw (1).

If necessary, grip at hexagon head.

Tilt brake caliper upwards.

Installation note:

Replace guide bolts.

Tightening torque 34 21 5AZ .

Fig 1: Removing Guide Screw

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Remove brake pads (1) in direction of arrow from brake anchor plate.

IMPORTANT: Mark any worn brake pads.
In the event of one-sided brake pad wear, do not change brake pads round.

Observe MINIMUM THICKNESS OF BRAKE PADS .

Clean brake pads.

Do not apply grease to brake lining backplate.

Fig 2: Removing Brake Pads

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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 3: 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).

Press brake piston fully back with special tool 34 1 050 .

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

Fig 4: Pressing Brake Piston

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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 5: Identifying Brake Piston Contact Surface

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

Fig 6: 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 surface (1) for the brake pads on the brake caliper mounting bracket. Clean guide surface (1) with brake cleaner and apply a thin coating of brake pad paste.

Fig 7: Identifying Brake Pads Guide Surface

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Apply a thin coating of brake pad paste to both sides of T-head of brake pad in area (1).

Fig 8: Identifying Brake Pad T-Head

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IMPORTANT: Brake pad with bulge (1) is intended for accommodating the brake pad wear sensor and must be fitted on the piston side.

Fig 9: Locating Brake Pad Bulge

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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" mark.
Read and comply with notes on BREAKING IN NEW BRAKE DISCS/BRAKE PADS .
When replacing pads, reset CBS display in accordance with factory specification.

Replacement

Remove pad retaining springs (1).

Installation note:

Fig 10: Identifying Brake Pad Retaining Springs

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