34 33 505 Removing and installing or replacing brake booster

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work:

Read and comply with GENERAL INFORMATION .
Remove the TANDEM BRAKE MASTER CYLINDER .
Remove HYDRAULIC UNIT .
Remove left FOOTWELL TRIM

IMPORTANT: There is a risk of switching the two brake lines (1)!
After removing tandem brake master cylinder and hydraulic unit, both brake lines (1) are exposed.
The installation position (see Fig 1) of the brake lines (1) must be marked prior to removal.

Fig 1: Identifying Brake Lines

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Pull the retaining clip (1) off the brake pedal and pull out the locking pin.

Unscrew nuts (2).

Installation note:

Replace self-locking nuts.

Tightening torque: 35 11 1AZ .

Fig 2: Pulling Retaining Clip

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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.

Fig 3: Removing Non-Return Valve From Brake Booster

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Remove non-return valve (1) from brake booster.

Carefully pull brake booster (2) out of bulkhead and tilt out.

If necessary, disengage brake line from holder on bulkhead and press slightly to one side.

Installation note:

Seal (1) must always be replaced.

Fig 4: Identifying Seal

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