34 33 071 Replacing Vacuum Hose For Brake Booster (S85)

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Necessary preliminary tasks:

Read and comply with General Information .
Remove lower section of microfilter housing. See 64 31 061 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT MICROFILTER HOUSING LOWER SECTION .

IMPORTANT: Before starting work, press the brake pedal to the floor several times to reduce the vacuum pressure in the brake booster. This makes it easier to remove the PA pipe.

Disconnect plug connection (1).

Unscrew nuts (2).

Unlock quick-release fastener (3) and detach vacuum hose.

Fig 1: Identifying Plug Connection And Nuts

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Release clamp (1) and detach vacuum line.

Installation:

Replace clamp (1).

Detach non-return valve (2) from brake booster and remove vacuum line (3).

Installation:

Check sealing ring in brake booster and replace if necessary.

Fig 2: Detaching Non-Return Valve

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When replacing vacuum line:

Release screws (1) and convert differential pressure switch (2).

IMPORTANT: Replace O-ring on differential pressure switch.

Fig 3: Identifying Pressure Switch And Screws

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