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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Overhaul >> Master Cylinder - BENDIX Mini-Master Cylinder >> Disassembly

Master Cylinder - BENDIX Mini-Master Cylinder: Disassembly

  1. Remove reservoir cover and diaphragm. Drain all brake fluid. Remove 4 reservoir bolts and separate reservoir and master cylinder body. Remove small "O" ring and both compensating valve seals from bottom of reservoir.
  2. 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.
  3. Remove snap ring from master cylinder bore using a small screwdriver. Release primary and secondary pistons and remove from bore.
  4. It may be necessary to plug front outlet port and apply low air pressure to front compensating valve port to remove secondary piston assembly.
WARNING: 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.