BMW 7 Series: Removing And Installing Or Replacing Both Rear Brake Discs

Necessary preliminary work

• Remove WHEELS.
• Remove and clean BRAKE PADS.

After completing repair work:

• Adjust PARKING BRAKE (not F10F11F18F25)
• Read and comply with notes on BRAKING IN NEW BRAKE DISCS/BRAKE PADS.

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.

NOTE: If the brake discs are replaced, you must also fit new brake pads.

Always replace brake discs in pairs.

Fig. 68: Checking Brake Disc Thickness

IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH).

Release screws (1). Detach brake caliper mounting bracket.

Installation note: Tightening torque 34 21 2AZ.

Fig. 69: Identifying Screws

IMPORTANT: To release brake disc: Do not under any circumstances strike friction ring with a hammer or similar! If necessary, carefully tap on base of brake disc chamber with a rubber mallet.

Unevenness on contact surface may result in distortion of brake disc!

Fig. 70: Identifying Screw And Brake Disc

Release screw (1) and remove brake disc (2).

Installation note: Replace screw.

Tightening torque 34 21 1AZ.

REMOVING AND INSTALLING/RENEWING A BRAKE ANCHOR PLATE/BRAKE GUARD PLATE AT REAR

Necessary preliminary tasks

• Remove PARKING BRAKE SHOES

NOTE: Picture shows wheel hub removed. Wheel hub does not have to be removed.

Release screws (1).

Installation note: Replace screws.

Tightening torque 34 21 3AZ.

Fig. 71: Identifying Screws, Retaining Plate And Brake Guard Plate

Remove retaining plate (2) in direction of arrow.

Feed out brake guard plate (3) over wheel hub.

REMOVING AND INSTALLING/REPLACING BOTH REAR DISC BRAKES

Notes

IMPORTANT:

• Brake pad wear sensor: after removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
• Retaining 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.

Necessary preliminary work

• Remove WHEELS.
• Remove BRAKE PAD WEAR SENSOR

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" marking.
• Read and comply with notes on BRAKING IN NEW BRAKE DISCS/BRAKE PADS.
• If necessary, when replacing pads, reset CBS display in accordance with factory specification.

Lift out retaining spring (1).

Fig. 72: Identifying Retaining Spring

Remove cover plug (1).

Fig. 73: Identifying Cover Plug

Unscrew guide bolts (1).

Withdraw brake caliper backwards.

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

Installation note: Tightening torque 34 21 4AZ.

Clean guide screws only; do not grease.

Check threads.

Fig. 74: Identifying Guide Bolts

Replace all guide bolts which are not in perfect condition.

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. 75: Turning Piston Back Fully Using Special Tool (34 1 050)

IMPORTANT: Mark any worn brake pads.

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

Remove outer brake pad.

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

Clean brake pads.

Do not grease backs of brake pads sleeve.

Fig. 76: Removing Outer Brake Pad

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.

Fig. 77: Checking Brake Disc Thickness Using Special Tool (34 1 280)

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 (1) for damage and replace if necessary.

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

Clean contact surface (2) of brake piston with brake cleaner and apply a thin coating of brake pad paste.

Fig. 78: Identifying Dust Boot, Brake Piston And Brake Cleaner Surface

Clean contact surfaces (1...2) of brake pad tee heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.

Fig. 79: Identifying Brake Caliper Housing Contact Surface

Clean contact surface (3) of brake caliper with brake cleaner and apply a thin coating of brake pad paste.

Fig. 80: Identifying Brake Caliper Contact Surface

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 and apply a thin coating of brake pad paste.

Fig. 81: Identifying Brake Pads Guide Surfaces On Brake Caliper Mounting Bracket

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