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Home >> BMW >> 2018 >> 440i 2D Convertible >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Repair (F32, F33 & F36) >> 34 31 Foot Brake/Tandem Brake Master Cylinder >> Removing and installing/replacing expansion tank for hydraulic brake control (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Removing and installing/replacing expansion tank for hydraulic brake control (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Necessary preliminary tasks: 

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

Unfasten plug connection (2) and disconnect.

G10095873Courtesy of BMW OF NORTH AMERICA, INC.

Loosen the lock screw (1).

Installation note: 

Tightening torque 34 31 2AZ .

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

G10095874Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Check rubber plug in tandem brake master cylinder for damage and replace if necessary.

Push the expansion tank vertically onto the tandem brake master cylinder.

G04726651Courtesy of BMW OF NORTH AMERICA, INC.

After completing repair work: 

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.