Necessary preliminary tasks

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Read and comply with GENERAL INFORMATION .
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.

If necessary, pull off supply hose of clutch hydraulic system if necessary.

Unfasten plug connection (1) and disconnect.

Release screw (2).

Pull expansion tank in direction of arrow vertically out of brake master cylinder.

Fig 1: Pulling Expansion Tank Out Of Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

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 2: Pushing Expansion Tank Onto Master Brake Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.