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Home >> GMC >> 1980 >> Rally G3500, Van Cargo >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> BENDIX/DELCO-Moraine Dual Piston Master Cylinder >> Overhaul >> Master Cylinder >> Disassembly

Master Cylinder: Disassembly

  1. Remove master cylinder cover and diaphragm, and drain fluid from reservoir. Pump piston by hand to remove any remaining fluid. On manual brake models, remove rubber boot from push rod. Depress piston and remove stop bolt. Remove snap ring from groove in bore.
  2. Remove both piston assemblies. Remove any internal parts remaining in piston bore. On Jeep CJ models, remove push rod from primary piston. Remove and discard all rubber parts from piston assemblies.
  3. On General Motors and Jeep CJ models, enlarge holes in tube seats using a 13/64" drill. Place a large flat washer over outlets and thread a 1/4" x 20 x 3/4" screw into seat. Tighten until seat is loosened. Remove seat, screw and washer. On all other Jeep models, thread a 6 x 32 x 5/8" self-tapping screw into tube seat. Push upward with 2 screwdrivers to remove seat.
    Fig 1: Removing Tube Seat from Master Cylinder
    G09317380Courtesy of NOT AVAILABLE
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