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

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 !

Necessary preliminary tasks:

Remove WHEELS
Remove BRAKE PAD WEAR SENSOR

IMPORTANT:

Both guide bolts must be released and then the brake caliper detached towards the rear!

The springs may be bent when only one bolt is released and the brake caliper is folded up!

Unscrew guide bolts (1).

If necessary, grip at hexagon head (2).

Installation note: Replace guide bolts.

Tightening torque 34 21 3AZ

Fig 1: Identifying Hexagon Head And Guide Bolts

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IMPORTANT:

Mark any worn brake pads.

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

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

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 measurement result and lowest value with SETPOINT VALUE .

IMPORTANT: New brake linings may only be installed if the brake disc thickness is greater than or equal to the MINIMUM BRAKE DISC THICKNESS (MIN TH) .

Fig 3: Identifying Special Tool (34 1 280)

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IMPORTANT:

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

Overflowing brake fluid will damage the paintwork.

Screw brake piston into brake caliper with special tools 34 6 309 , 34 6 306 , 34 6 307 , and 34 6 308 .

Fig 4: Identifying Special Tools (34 6 309, 34 6 306, 34 6 307 And 34 6 308)

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

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.

Fig 5: Identifying Contact Surface Of Brake Piston

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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 Contact Surface Of Brake Caliper

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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 Guide Surface For Brake Pads

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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 Paste Application Area

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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: Identifying Brake Pad

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After completing work:

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 .
Fully depress brake pedal several times so that brake pads contact brake discs.
If necessary, when replacing pads, reset CBS display in accordance with factory specification.

Replacement:

Remove lining springs (1) and replace.

Installation note:

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. Instead, clean with brake cleaner and apply a thin coating of brake pad paste.

Fig 10: Identifying Lining Retaining Springs

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