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Home >> BMW >> 1998 >> 750iL >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Repair Instructions >> Master Brake cylinder >> 34 31 500 Removing and installing / replacing master brake cylinder

34 31 500 Removing and installing / replacing master brake cylinder

IMPORTANT:
  1. Note "General Information",
  2. Refer to 34 00... GENERAL DATA 
  3. After the work steps are completed, bleed the brake system, refer to:
  4. Vehicles with ABS 34 00 047
  5. Vehicles with ABS/ASC+T, DSC1, DSC2 34 00 048
  6. Vehicles with DSC3 34 00 050

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
G03213693

Pull off supply hose on clutch hydraulics (1).

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

Installation: 

  1. Push the expansion tank vertically onto the master brake cylinder.
    Fig 2: Identifying Supply Hose On Clutch Hydraulics & Expansion Tank
    G03213694

Loosen the screw connections of the brake lines.

NOTE: Close off the brake lines and the master brake cylinder using the appropriate seal plugs.

Installation: 

  1. Tightening torque. Refer to BRAKES - TIGHTENING TORQUES .
    Fig 3: Loosening Screw Connections Of Brake Lines
    G03213695

Loosen the nuts and pull the master brake cylinder out of the brake unit.

Installation: 

  1. Replace self-locking nuts.
  2. Tightening torque. Refer to BRAKES - TIGHTENING TORQUES .
    3. Fig 4: Loosening Nuts & Pulling Master Brake Cylinder Out Of Brake Unit
    G03213696

Installation: 

  1. Replace O-ring.
    Fig 5: Replacing O-Ring
    G03213697

Fill expansion tank up to "MAX" mark with new brake fluid.

Check seal (1).

Fig 6: Identifying Check Seal
G03213698
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