34 33 505 Removing and installing or replacing brake booster

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work

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: Identifying Brake Lines, Vaccum Line And 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: Identifying Retaining Clip And 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.

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

Installation note:

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

Fig 3: Pulling Brake Booster From Bulkhead

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement

Modify TANDEM BRAKE MASTER CYLINDER .

F04 only

The following service function must be performed after completing the repair work:

Calibrate brake pedal travel sensor.