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

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. 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 Brake Pedal Locking Clip With Mounting Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not bend brake lines.

Unfasten brake lines (1).

Installation:

Tightening torque 34 32 1AZ .

Fig 2: Disconnecting Hydraulic Line From Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Installation:

Tightening torque 34 32 1AZ .

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