Necessary preliminary tasks

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Read and comply with GENERAL INFORMATION .
Remove BRAKE MASTER CYLINDER
Disconnect BATTERY NEGATIVE LEAD
Remove TRIM PANEL for pedal assembly

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

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Disconnect plug connection (1).

Release screw (2) and swing out battery terminal.

Fig 2: Removing Battery Terminal

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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.

Fig 3: Identifying Plug Connection, Recoil Spring, Locking Clip And Nuts

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Unscrew nuts (4).

Installation:

Tightening torque 35 11 1AZ .

Move brake booster a little towards engine compartment.

Feed piston rod (1) by turning bearing support 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 4: Removing Piston Rod Out Of Retaining Lug

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Remove bearing support.

IMPORTANT: Do not use any force when removing and installing the brake unit; the brake unit can be damaged under certain circumstances.
Brake lines must not be bent.

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

Fig 5: Identifying Brake Booster

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