Removal & Installation

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Suck the brake fluid out of the expansion tank. Use a suction device used exclusively for drawing off brake fluid.
Pull supply hose (1) off of clutch hydraulic system, if necessary. See Fig 1.
On vehicles with a precharging pump for DSC, the supply hose must be secured in a vertical position to prevent fluid from emerging.
On all models, lift out the expansion tank from the master brake cylinder by tilting it laterally.
Check rubber plug in master brake cylinder. No damage may be present.
Push the expansion tank vertically onto the master brake cylinder.
Connect hoses, fill expansion tank, and bleed system. See BLEEDING BRAKE SYSTEM .

Fig 1: Locating Supply Hose Of Clutch Hydraulic System

Courtesy of BMW OF NORTH AMERICA, INC.