34 33 505 Removing and installing or replacing brake booster

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. 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 brake master cylinder
Remove hydraulic unit
Remove left footwell trim . See 51 45 185 REMOVING AND INSTALLING/REPLACING PANEL FOR PEDALS .

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

Unscrew nuts (2).

Installation:

Replace self-locking nuts.

Tightening torque, see 35 11 PEDAL ASSEMBLY CONSOLE .

Fig 1: Identifying Locking Clip And Slacken Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

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 (1) out of bulkhead and tilt out.

If necessary, disengage brake line from holder on bulkhead and press slightly to one side.

Replacement:

Modify non-return valve .

Fig 2: Pulling Brake Booster

Courtesy of BMW OF NORTH AMERICA, INC.