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34 33 071 Replacing Vacuum Hose For Brake Booster (N73)

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Necessary Preliminary Tasks: 

IMPORTANT:

Before beginning work, fully press the brake pedal several times to reduce the vacuum pressure in the brake booster. This makes it easier to remove the PA pipe. Non-return valve and PA pipe are welded together and are replaced together as a single unit.

Remove microfilter (1).

Fig 1: Identifying Microfilter
G03292609Courtesy of BMW OF NORTH AMERICA, INC.

Release screws and remove cover (1).

Detach non-return valve (2) from brake booster.

Installation: 

Check seal in brake booster and replace if necessary.

Make sure cover engages properly.

Fig 2: Detaching Non-Return Valve From Brake Booster
G03292610Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten hose clip (1).

Disconnect plug connections (2).

Detach holder (3) from vacuum line.

Installation: 

Replace hose clip.

Fig 3: Identifying Hose Clip, Plug Connections And Vacuum Line
G03292611Courtesy of BMW OF NORTH AMERICA, INC.

Detach quick-connect couplings (1) on tank vent valves and line connection.

Unclip purge air line (3) from holder (2) and remove.

Fig 4: Locating Quick-Connect Couplings
G03292612Courtesy of BMW OF NORTH AMERICA, INC.

Detach holder (1) and feed out vacuum line (2) by twisting upwards.

Fig 5: View Of Vacuum Line And Holder
G03292613Courtesy of BMW OF NORTH AMERICA, INC.
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