BMW 7 Series: Removing And Installing/Replacing Both Front Brake Discs

Necessary preliminary work

• Remove FRONT WHEELS
• Remove and clean BRAKE PADS

NOTE: After completing work, 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.

Brake discs may only be replaced in pairs (on each axle).

Fig. 39: 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).

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

Installation note: Tightening torque 34 11 2AZ.

Fig. 40: 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.

Clean contact surface of brake disc at wheel hub thoroughly and remove traces of corrosion.

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

Fig. 41: Identifying Screws And Brake Disc

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

Installation note: Replace screw.

Tightening torque 34 11 1AZ.

REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT FRONT BRAKE CALIPER

Necessary preliminary work

• REMOVE WHEEL
• Read and comply with GENERAL INFORMATION.

After completing work: replace fluid in brake system.

Press brake pedal down to floor and secure with pedal support.

NOTE: The pedal support may only be released when the brake lines are reconnected.

This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Fig. 42: Pressing Brake Pedal Down

Release union screw (1).

Installation note: Tightening torque 34 32 2AZ.

If necessary, grip at knurling (2).

IMPORTANT: Never twist brake hose when installing it and avoid all contact with parts attached rigidly to the body.

If necessary, remove BRAKE PAD WEAR SENSOR.

Fig. 43: Identifying Union Screw And Knurling

Lever out retaining spring (1) in direction of arrow towards rear.

Installation note: Place retaining spring (1) first at top and bottom of brake caliper and then allow to engage in recess (2) of brake caliper housing.

Fig. 44: Identifying Retaining Spring And Recess

Remove plastic plugs (1).

Fig. 45: Identifying Plastic Plugs

Unscrew guide bolts (1).

Withdraw brake caliper backwards.

Installation note: Only clean guide bolts; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ.

Fig. 46: Identifying Guide Bolts

IMPORTANT: Mark any worn brake pads.

Remove brake pads in direction of arrow.

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

If necessary, clean BRAKE CALIPER AND PADS.

Fig. 47: Removing Brake Pads

Equipment specification, high-speed brake system.

IMPORTANT: Mark any worn brake pads.

Remove brake pads in direction of arrow.

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

If necessary, clean BRAKE CALIPER AND PADS.

Fig. 48: Removing Brake Pads

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