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

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: High-voltage system - danger to life!

WARNING: Compliance with the following points is mandatory before beginning work:

Observe SAFETY INSTRUCTIONS for handling with hybrid vehicles

Necessary preliminary tasks:

Read and comply with GENERAL INFORMATION .
Remove LEFT MICROFILTER HOUSING COVER

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.

Unfasten plug connection (1) and disconnect.

Remove wiring harness from holder (2).

Release screw (3) and lift off expansion tank (4) vertically in upward direction.

Fig 1: Identifying Plug Connection, Holder, Screw And Expansion Tank

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 Vertically Onto Master Brake Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.