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

Suck the brake fluid out of the expansion tank. Use a suction bottle used exclusively for drawing off brake fluid.

Fig 1: Sucking Brake Fluid Out Of Expansion Tank

Pull off supply hose (1) of clutch hydraulic system if necessary.

On vehicles with a pre-charging pump for DSC, the supply hose must be secured in a vertical position to prevent fluid from emerging.

Lift out the expansion tank (2) from the master brake cylinder by tilting it laterally.

Installation: 

1. Check rubber plug in master brake cylinder; no damage may be present.
2. Push the expansion tank vertically onto the master brake cylinder.
   Fig 2: Identifying Supply Hose & Expansion Tank