Master Cylinder: Disassembly

Thoroughly clean outside of master cylinder. Remove remaining brake fluid. Remove reservoir and dust boot (if equipped). Depress primary piston assembly. See Fig 1 .
From rear of cylinder bore, remove retaining ring, washer, primary piston assembly, and return spring. Remove stopper bolt and secondary piston by blowing compressed air through outlet port. See Fig 1 .
Carefully remove the secondary piston assembly and return spring. Remove fittings, check valves and springs.

Fig 1: Exploded View of Typical Master Cylinder

Courtesy of MAZDA MOTORS CORP.