34 33 071 Replacing vacuum hose for brake booster (S85)

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Necessary preliminary tasks:

Read and comply with General Information . See 34 00 ... GENERAL INFORMATION
Remove lower section of microfilter housing. 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 detach the lines.

Disconnect plug connection (1). Unscrew nuts (2). Unlock quick-release fastener (3) and detach vacuum hose.

Fig 1: Unlock Quick-Release Fastener (3) And Detach Vacuum Hose

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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).

Fig 2: Detach Non-Return Valve (2) From Brake Booster And Remove Vacuum Line (3)

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Installation: Check sealing ring in brake booster and replace if necessary.

When replacing vacuum line: Release screws (1) and convert differential pressure switch (2).

Fig 3: Release Screws (1) And Convert Differential Pressure Switch (2)

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Important! Replace O-ring on differential pressure switch.