Master Cylinder: Disassembly
Courtesy of FORD MOTOR CO.
- With master cylinder removed from vehicle, clean outside of cylinder, remove filler cap and diaphragm, and drain any fluid still in cylinder. Remove piston stop from cylinder, and remove "O" ring seal from stop.
- Remove dust boot, then remove snap ring retaining piston assemblies. Remove push rod (if so equipped) and primary piston assembly from cylinder bore. Apply air pressure to forward outlet port of cylinder and carefully blow secondary piston assembly out of bore. Remove return spring, spring retainer, cup protector, and cups from secondary piston.
- Place master cylinder in a vise with outlet ports facing up, using care not to damage housing. Install spare brake line tube nut in brake outlet port supplying drum brakes. Position flat washer over self-tapping 8-32 screw and thread screw into outlet port through brake line nut. While holding screw to prevent its turning, turn tube nut out of port. This procedure will remove tubing seat. Remove master cylinder from vise and remove residual valve(s).