Master Cylinder: Disassembly

Thoroughly clean outside of master cylinder and pour out any remaining brake fluid. If equipped, remove reservoir and dust boot. Depress primary piston assembly. See Fig 1.
Remove retaining ring from rear of cylinder bore, and remove washer, primary piton assembly and return spring. Depress secondary piston, remove stop bolt and insert guide pin to prevent damage to secondary piston cup. See Figure.
Carefully withdraw 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.

Some models may vary slightly.