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Home >> BMW >> 2019 >> X3 M40i >> Repair and Diagnosis >> External Pages >> Different car >> Section 277 (Brakes - Repair) >> Master Brake Cylinder >> 34 31 505 Removing and installing/replacing tandem brake master cylinder for DSC

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

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Necessary preliminary tasks: 

After completing repair work, bleed BRAKE SYSTEM WITH DSC .

IMPORTANT: Before beginning repair work, fully press the brake pedal several times to reduce the vacuum pressure in the brake servo.

Undo pipes (1) and close off.

Installation note: 

Tightening torque 34 32 1AZ .

Undo nuts (2) and pull tandem brake master cylinder (3) out of the brake servo.

Installation note: 

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Fig 1: Identifying Tandem Brake Master Cylinder
G09947371Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Replace sealing ring (1).

When inserting the tandem brake master cylinder, the brake servo, make sure that the pushrod of the brake servo and the tandem brake master cylinder are exactly aligned with each other.

Fig 2: Identifying Sealing Ring
G04726654Courtesy of BMW OF NORTH AMERICA, INC.