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

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.