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

WARNING: This page is about a different variant/trim than selected.

Special tools required:

32 1 270

Necessary preliminary tasks:

Remove Expansion Tank.
Remove Footwell Trim.
Read and comply with General Information.

After completing work:

Bleeding brake system with DSC

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.

For tightening torque refer to 35 11 1AZ in 35 11 PEDAL ASSEMBLY CONSOLE .

Fig 1: Identifying Brake Cylinder Locking Clip And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten brake lines (1).

Installation:

For tightening torque refer to 34 32 1AZ in34 32 BRAKE LINES .

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:

For tightening torque refer to 34 32 1AZ in34 32 BRAKE LINES .

IMPORTANT: Do not bend brake lines.

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

Installation:

Replace self-locking nuts.

For tightening torque refer to 34 31 1AZ in 34 31 BRAKE MASTER CYLINDER .

Fig 2: Identifying Brake Lines, Retaining Nuts And Hydraulic Unit Line

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing ring.

Fig 3: Identifying Brake Cylinder 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: Inserting Brake Master Cylinder And Brake Booster

Courtesy of BMW OF NORTH AMERICA, INC.