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

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, 2007 BMW X3, and 2006 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read and comply with General Information, see 34 00 ... General Information .
Remove expansion tank, see 34 31 181 Removing and installing/replacing expansion tank for hydraulic brake actuation .
After completing tasks, bleed brake system, see 34 00 050 Bleeding brake system with DSC .

Unfasten brake lines (1).

Installation:

Note changed tightening torque.

Tightening torque: 34 32 6AZ, see 34 32 BRAKE LINES .

Release nuts (2) and pull brake master cylinder (3) in direction of arrow straight out of brake booster.

Installation:

Replace self-locking nuts.

Tightening torque: 34 31 1AZ, see 34 31 BRAKE MASTER CYLINDER .

Fig 1: Brake Master Cylinder, Brake Lines And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace O-ring (1).

Fig 2: O-ring

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

When inserting brake master cylinder (2) into brake booster (1), make sure that pressure rod of brake booster (1) and pressure rod of brake master cylinder (2) lie on a single plane.

Fig 3: Brake Master Cylinder Into Brake Booster

Courtesy of BMW OF NORTH AMERICA, INC.