BMW X5: Brake Booster

REPLACING VACUUM HOSE FOR BRAKE BOOSTER (N52K)

IMPORTANT: Before beginning work, fully press the brake pedal several times to reduce the vacuum pressure in the brake booster. This makes it easier to remove the vacuum hose. Vacuum hose and non-return valve are welded together and are replaced together as a single unit.

Necessary preliminary tasks:

• Read and comply with General Information.
• Remove left partition wall for equipment compartment

Detach partition wall seal upper section (1) in direction of arrow.

Remove non-return valve (2) from brake booster.

Installation:

Check seal for non-return valve and replace if necessary.

Unlock quick-connect coupling (1) and detach vacuum line.

REMOVING AND INSTALLING/REPLACING BRAKE BOOSTER

Necessary preliminary tasks:

• Read and comply with General Information.
• Remove brake master cylinder.
• Remove left footwell trim.

Detach locking clip (1) from brake pedal, disengage and pull out locking pin.

Unscrew nuts (2).

Installation:

Replace self-locking nuts.

Tightening torque 35 11 1AZ.

Fig. 75: Detaching Locking Clip From Brake Pedal

IMPORTANT: Do not use any force when removing and installing the brake unit; the brake unit can be damaged under certain circumstances.

Brake lines must not be bent.

Remove non-return valve (1) from brake booster.

Carefully pull brake booster (2) out of bulkhead and tilt out.

If necessary, press brake lines to one side slightly.

Fig. 76: Removing Non-Return Valve From Brake Booster

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