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Master Cylinder: Disassembly

NOTE: Removal of proportioning valves is not required in master cylinder overhaul procedure. If proportioning valve service is required, see PROPORTIONER VALVES  under REMOVAL & INSTALLATION.
  1. Clean exterior of master cylinder and reservoir with clean shop towels and denatured alcohol. Remove reservoir cap and diaphragm. Empty fluid from reservoir and discard. Remove fluid level sensor switch by squeezing tabs with pliers.
  2. Clamp master cylinder in vise by mounting flange and remove reservoir. Remove reservoir by driving spring pins out with 1/8 in. punch. Be careful not to damage reservoir or cylinder body while removing pins. Pull straight up on reservoir to remove.
  3. Depress primary piston and remove retainer being careful not to damage piston bore or retainer groove. To remove piston assemblies, apply low pressure unlubricated air to front upper outlet port with other ports plugged. Remove seals and spring retainer from secondary piston assembly.
Fig 1: Exploded View of Delco Compact Master Cylinder
G200031Courtesy of GENERAL MOTORS CORP.
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