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Home >> BMW >> 2018 >> M4 2D Convertible, Automatic DCT Trans >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Repair -- M4 (F82 & F83) >> 34 33 Brake Booster >> Removing and installing or replacing brake booster

Removing and installing or replacing brake booster

Necessary preliminary work: 

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 illustration) of the brake lines (1) must be marked prior to removal.

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 .

G10095886Courtesy of BMW OF NORTH AMERICA, INC.
G10095887Courtesy of BMW OF NORTH AMERICA, INC.
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 bulkhead and tilt out.

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

G10095888Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Seal (1) must always be replaced.

G10095889Courtesy of BMW OF NORTH AMERICA, INC.