34 31 181 Removing and installing/replacing expansion tank for hydraulic brake control

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks

Read and comply with GENERAL INFORMATION .
Remove COVER FOR COWL PANEL on left.

NOTE: Extract brake fluid out of expansion tank.

Use a suction bottle used exclusively for drawing off brake fluid.

Do not reuse drawn out brake fluid.

Disconnect plug connection (1).

Pull out locking pin (2) and lift out expansion tank in vertical direction.

Fig 1: Identifying Plug Connection And Locking Pin

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Check rubber plugs (1) in brake master cylinder for damage and replace if necessary.

Push the expansion tank vertically onto the master brake cylinder.

Fig 2: Identifying Brake Master Cylinder Rubber Plugs

Courtesy of BMW OF NORTH AMERICA, INC.