BMW X3 Service & Repair Manual: Removing and installing or replacing brake booster

Necessary preliminary work:

• Read and comply with GENERAL INFORMATION.
• Remove left footwell trim .
• Remove BRAKE MASTER CYLINDER.
• Remove WIPER MOUNTING BRACKET .

Detach retaining clip (1) on brake pedal.

Pull out locking pin.

Unscrew nuts (2).

Installation note: Replace self-locking nuts.

Release brake lines (1) from holder on bulkhead.

If necessary disconnect plug connection of vacuum sensor.

Pull vacuum line (2) out of brake booster.

Installation note: Check gasket, replace if necessary.

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.

Carefully pull brake booster (3) out of bulkhead and tilt out.

Installation note:

Make sure seal (2) is present and correctly seated.

The protective film on the connection of the vacuum line must be removed when replacing the brake booster!