Necessary preliminary tasks

• Read and comply with GENERAL INFORMATION .
• Remove BRAKE MASTER CYLINDER
• Remove left SUSPENSION CROSS-BRACE
• Remove TRIM PANEL for pedal assembly
• Remove CLUTCH MASTER CYLINDER from bearing block (clutch hydraulic system remains closed)

Release brake lines (1) and remove.

Installation: 

Tightening torque 34 32 1AZ .

Remove non-return valve (2) in direction of arrow from brake booster.

Installation: 

Check rubber seal in brake booster and replace if necessary.

Fig 1: Removing Non-Return Valve From Brake Booster

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection (1).

Unhinge the recoil spring (2).

Remove retaining clip (3).

Installation: 

Replace locking clip (3).

Locking clip (3) must be seated with both legs in the pin groove.

Release screws (4).

Installation: 

Tightening torque 35 11 1AZ .

Fig 2: Identifying Plug Connection, Recoil Spring, Locking Clip And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Move brake booster a little towards engine compartment.

Feed piston rod (1) by turning bearing block out of retaining lug (2).

Installation: 

Feed brake pedal in depressed position into piston rod, moving the brake booster a little towards the engine compartment.

Fig 3: Turning Bearing Block Out Of Retaining Lug

Courtesy of BMW OF NORTH AMERICA, INC.

Remove mounting block.