34 33 505 Removing and installing or replacing brake booster (2' Series coupe and convertible, 2017-2021)

Necessary preliminary tasks:

Refer to READING AND COMPLYING WITH GENERAL INFORMATION .
Refer to REMOVING BRAKE MASTER CYLINDER .
Refer to REMOVING HYDRAULIC UNIT .
Refer to REMOVING FOOTWELL TRIM .

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IMPORTANT: There is a risk of switching the two brake lines (1)!
After the master cylinder and hydro aggregate have been removed, the two brake lines (1) will be exposed.
The installation position (see graphic) of the brake lines (1) must be marked prior to removal.

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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 .

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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.

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

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

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

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Installation note:

When the brake booster is replaced, pay attention to the following:

Installation sequence: Gasket (1), shim (2), gasket (1).
Gaskets (1) must always be replaced.