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

Necessary preliminary tasks:

Follow general instructions, see 34 00 ... General Information .
Remove left partition wall for equipment compartment .
Remove non-return valve, see 34 33 051 Removing and installing/replacing nonreturn valve for brake booster from brake booster.
After completing tasks, bleed brake system, see 34 00 050 Bleeding brake system with DSC .

NOTE: Suck the brake fluid out of the 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.

Pull off supply hose (2) of clutch hydraulic system if necessary.

Release retaining screw (3).

Installation:

Tightening torque: 34 31 3AZ, see 34 31 BRAKE MASTER CYLINDER .

Pull expansion tank (4) vertically out of brake master cylinder.

Fig 1: Pulling Expansion Tank And Supply Hose

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: Checking Rubber Plug In Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.