34 31 505 Removing and installing / replacing master brake cylinder for DSC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

32 1 270

Necessary preliminary tasks:

REMOVE EXPANSION TANK .
Remove FOOTWELL TRIM .
READ AND COMPLY WITH GENERAL INFORMATION .

After completing tasks, BLEED BRAKE SYSTEM WITH DSC .

Remove locking clip (1) and disengage and pull out locking pin.

Slacken nuts (2).

Installation:

Replace self-locking nuts.

Tightening torque 35 11 1AZ .

Fig 1: Identifying Slacken Nuts And Locking Clip

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten brake lines (1).

Detach brake lines at junction (2) and remove short sections.

Seal off brake lines and brake master cylinder with plugs 32 1 270 .

Installation:

Fit lines at both connection points and then tighten down.

Tightening torque 34 32 1AZ .

Release nuts (3) and feed brake master cylinder out of brake booster.

Installation:

Fig 2: Identifying Brake Lines And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Installation:

Replace sealing ring.

Fig 3: Identifying Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Brake booster (1) must be loosely screwed into place so as not to jam brake master cylinder (2) during installation.

Installation:

When inserting the brake master cylinder (2) into the brake booster (1), make sure the pressure rod of the brake booster and that of the brake master cylinder meet each other on one level.

Fig 4: Identifying Brake Booster And Jam Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.