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Master Cylinder: Disassembly

  1. Remove master cylinder from vehicle. See MASTER CYLINDER  under REMOVAL & INSTALLATION.
  2. Wipe the reservoir cap clean.
  3. Remove the reservoir cap and the diaphragm. See Fig 1.
    Fig 1: Exploded View Of Master Cylinder
    G00208954Courtesy of GENERAL MOTORS CORP.
    4. NOTE: The reservoir cap and the diaphragm may be inspected and serviced without removing the master cylinder from the vehicle.
  4. Replace the reservoir cap and the diaphragm if cuts, cracks, nicks or deformation are evident.
  5. Remove the fluid level sensor. See FLUID LEVEL SENSOR .
  6. Remove the proportioning valves. See MASTER CYLINDER PROPORTIONING VALVES .
  7. Remove the retainer while depressing the primary piston. Use care so that you do not damage the piston, the bore or the retainer groove.
  8. Apply low pressure, non-lubricated, compressed air into the upper outlet port at the blind end of the bore while the other outlet ports are plugged. Do this in order to remove the primary piston, secondary piston, spring, spring retainer. See Fig 1.
  9. Remove the seals and the spring retainer from the secondary piston. See Fig 2.
    Fig 2: Removing & Installing Master Cylinder Reservoir Spring Pins
    G00208945Courtesy of GENERAL MOTORS CORP.
  10. Inspect the master cylinder for scoring or corrosion. Replace the master cylinder if damage exists. Do not use abrasives in the bore.
  11. Clean all of the parts in clean, denatured alcohol.
  12. Dry the parts with non-lubricated, compressed air.
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