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Master Cylinder: Disassembly

  1. Clean outside of master cylinder. Remove caps or cover/diaphragm assembly. Remove brake fluid level indicator, if used. Pump and drain all brake fluid from master cylinder.
  2. Clamp master cylinder in vise by mounting flange. Remove plastic reservoir and grommets on two piece master cylinders.
  3. Discard reservoir assembly used on Ford diagonal split master cylinder. Remove fluid control valve using a 12mm socket on Ford diagonal split master cylinder. See Fig 2 .
  4. Remove push rod, if used. Press primary piston inward and remove stop bolt, if used. Press primary piston inward and remove snap ring. Remove primary piston assembly. Apply compressed air and remove secondary piston assembly.
Fig 1: Typical Cast Iron Tandem Master Cylinder
G27223Courtesy of FORD MOTOR CO.
Fig 2: Ford Diagonal Split Master Cylinder
G27224Courtesy of FORD MOTOR CO.