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

Necessary preliminary tasks:

Read and comply with GENERAL INFORMATION .
Remove EXPANSION TANK .
Remove BRAKE BOOSTER .

After completing repair work, bleed BRAKE SYSTEM WITH DSC .

IMPORTANT: Before beginning work, fully press the brake pedal several times to reduce the vacuum pressure in the brake servo.

Set brake booster down on a suitable surface.

Release nuts (1) and withdraw brake master cylinder (2) from brake booster (3).

Installation note:

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Fig 1: Identifying Nuts, Brake Booster And Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace sealing ring (1).

When inserting the brake master cylinder into the brake servo, make sure the pushrod of the brake servo and the brake master cylinder are in perfect alignment.

Fig 2: Identifying Brake Master Cylinder Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.