34 31 500 Removing and installing/replacing brake master cylinder

Special tools required:

32 1 270

Necessary preliminary tasks:

Remove EXPANSION TANK .
Read and comply with GENERAL INFORMATION .

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

After completing repair work, bleed BRAKE SYSTEM WITH DSC .

IMPORTANT: Do not bend brake lines.
Close off brake lines and brake master cylinder with seal plugs 32 1 270 .

Unfasten brake lines (1).

Installation note:

Tightening torque 34 32 1AZ .

Fig 1: Removing Brake Master Cylinder From Brake Servo

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts (2) and feed brake master cylinder out of brake servo.

Installation note:

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Installation note:

Replace sealing ring (1).

Check rubber plugs (2) and replace if necessary.

Fig 2: Identifying Sealing Ring And Rubber Plugs

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

When inserting the tandem brake master cylinder (1) into the brake servo, make sure the anti- roll bar link of the brake servo and the tandem brake master cylinder meet each other on one level.

Fig 3: Identifying Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.