34 33 505 Removing and installing or replacing brake booster

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. 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 .
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, Vacuum 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 Out Of Bulkhead

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement:

Modify BRAKE MASTER CYLINDER .