34 33 505 Removing And Installing Or Replacing Brake Booster

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2018 BMW M6, 2018 BMW 650i xDrive, 2018 BMW 650i, 2018 BMW 640i xDrive, and 2018 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read and comply with GENERAL INFORMATION .
Remove rear left DOME CROSS-BRACE .
Remove left footwell trim. See 51 45 184 REMOVING AND INSTALLING (REPLACING) TRIM PANEL FOR PEDAL MECHANISM (ECE ONLY) or 51 45 184 REMOVING AND INSTALLING (REPLACING) TRIM PANEL FOR PEDAL MECHANISM (US ONLY) .
In vehicles with coolant expansion tank in the front left side panel: Remove COOLANT FILLER NECK .

After completing repair work, bleed BRAKE SYSTEM WITH DSC .

Extract brake fluid out of expansion tank.

Unfasten brake lines (1).

Installation note:

Tightening torque 34 32 1AZ .

Disconnect vacuum line (2).

Installation note:

Check gasket (3), replace if necessary.

Fig 1: Brake And Vacuum Line, Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Detach retaining clip (1) on brake pedal.

Pull out locking pin.

Unscrew nuts (2).

Installation note:

Replace self-locking nuts.

Tightening torque 35 11 1AZ .

Fig 2: Retaining Clip On Brake Pedal With Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not use any force when removing and installing the brake booster; the brake booster can be damaged under certain circumstances.
Brake lines must not be bent.

Fig 3: Identifying Brake Booster And Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully pull brake booster (1) out of bulkhead and tilt out.

Installation note:

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

Replacement:

Remount TANDEM BRAKE MASTER CYLINDER .