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34 33 505 Removing and installing or replacing brake booster

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Necessary preliminary tasks: 

After repair work, BLEED BRAKE SYSTEM WITH DSC .

Extract brake fluid out of expansion tank.

Unfasten brake lines (1).

Installation note: 

Tightening torque 34 32 1AZ .

Disconnect vacuum line (2).

Installation note: 

Check gasket (3), replace if necessary.

Fig 1: Identifying Brake Lines, Vacuum Line And Seal
G06890015Courtesy of BMW OF NORTH AMERICA, INC.

Detach retaining clip (1) on brake pedal.

Pull out locking pin.

Unscrew nuts (2).

Installation note: 

Replace self-locking nuts.

Tightening torque 35 11 1AZ .

Fig 2: Identifying Retaining Clip And Nuts
G06890016Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT:

Do not use any force when removing and installing the brake booster; the brake booster can be damaged under certain circumstances.

Brake lines must not be bent.

Brake lines must not be bent.

Fig 3: Identifying Brake Booster And Seal
G06890017Courtesy of BMW OF NORTH AMERICA, INC.

Carefully pull brake booster (1) out of bulkhead and tilt out.

Installation note: 

Make sure seal (2) is present and correctly seated.

Replacement: 

Modify TANDEM BRAKE MASTER CYLINDER .