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

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2017 BMW 550i GT xDrive, 2017 BMW 535i GT xDrive, 2017 BMW 535i GT, 2016 BMW 550i GT xDrive, and 2016 BMW 535i GT xDrive. 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 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 Brake Master Cylinder, Brake Booster And Nuts

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 Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

F04 only

The brake pedal travel sensor has to be transferred when the brake master cylinder is replaced.

The following service function must be performed after completing the repair work:

Calibrate brake pedal travel sensor.