34 31 505 Removing And Installing / Replacing Master Brake Cylinder For DSC

WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. 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. See 51 45 185 REMOVING AND INSTALLING/REPLACING TRIM FOR PEDAL ASSEMBLY .
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.

Tighten to 21 Nm.

Fig 1: Identifying Locking Clip And Nuts

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.

Tighten to specified torque. See 34 32 1AZ.

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

Fig 2: Identifying Brake Lines, Junction And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace self-locking nuts.

Tighten to specified torque. See 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 Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.