3431505 Removing and installing/replacing master brake cylinder for DSC

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2011 BMW 323i, 2010 BMW 335xi, and 2010 BMW 335i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks

Remove EXPANSION TANK .
Remove FOOTWELL TRIM .
Read and comply with GENERAL INFORMATION .

IMPORTANT: The brake booster must be slackened so that the brake master cylinder can be removed and installed without tilting!

Remove locking clip (1) and disengage and pull out locking pin.

Slacken nuts (2).

Installation:

Replace self-locking nuts.

Tightening torque 35 11 1AZ .

Fig 1: Identifying Locking Pin And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not bend brake lines.

Unfasten brake lines (1).

Installation:

Tightening torque 34 32 1AZ .

Close off brake lines and brake master cylinder with plugs 32 1 270.

If necessary, detach line (3) from hydraulic unit and press downwards slightly.

Installation:

Tightening torque 34 32 1AZ .

Fig 2: Disconnecting Hydraulic Line From Hydraulic Unit And Pressing Downwards

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation:

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Installation

Replace sealing ring.

Fig 3: Identifying Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

When inserting the brake master cylinder (2) into the brake booster (1), make sure the pressure rod of the brake booster and that of the brake master cylinder meet each other on one level.

Fig 4: Identifying Brake Master Cylinder And Brake Booster

Courtesy of BMW OF NORTH AMERICA, INC.

After installation

BLEEDING BRAKE SYSTEM WITH DSC