34 31 181 Removing and Installing/Replacing Expansion Tank For Hydraulic Brake Actuation

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 BMW 750i, 2008 BMW 750Li, 2007 BMW 750i, 2007 BMW 750Li, and 2006 BMW 750i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Read and comply with General Information. See 34 00 ... GENERAL INFORMATION

Observe safety when raising the vehicle.

Remove microfilter (1).

Fig 1: Identifying Microfilter

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Suck the brake fluid out of the expansion tank.

IMPORTANT:

Do not reuse drawn out brake fluid.

Use suction bottle exclusively to draw off brake fluid.

Fig 2: Sucking Brake Fluid Out Of Expansion Tank

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Disconnect plug connection (1).

Release hose clip (2) and detach supply hose (3) of precharging pump from expansion tank.

IMPORTANT: Supply hose must be secured in vertical position so that no fluid emerges.

Fig 3: Identifying Plug Connection, Hose Clip & Detach Supply Hose

Courtesy of BMW OF NORTH AMERICA, INC.

Press retaining tabs (4) on left and right outwards and pull off expansion tank (5) vertically upwards.

IMPORTANT:

Check rubber plug in brake master cylinder for damage and replace if necessary.

Push the expansion tank vertically onto the master brake cylinder.

Fig 4: Pressing Retaining Tabs

Courtesy of BMW OF NORTH AMERICA, INC.