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Home >> GMC >> 1981 >> Forward Control 7.4L Eng VIN W, Standard Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Master Cylinders - BENDIX Mini-Master Cylinder >> Overhaul >> Master Cylinder >> Disassembly

Master Cylinder: Disassembly

  1. Remove reservoir cover and diaphragm. Drain all brake fluid. Remove four reservoir bolts and separate reservoir and master cylinder body. Remove small "O" ring and both compensating valve seals from bottom of reservoir. DO NOT remove 2 filters from bottom of reservoir unless they are damaged. Push in primary piston and remove compensating valve poppets and springs from ports in master cylinder body.
  2. Remove snap ring from master cylinder bore using a small screwdriver. Release primary and secondary pistons and remove from bore. It may be necessary to plug front outlet port and apply low air pressure to front compensating valve port to remove secondary piston assembly.
    CAUTION: If air pressure is used to remove piston, place open end of bore 1" away from padded surface to catch piston and prevent personal injury.
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