Mitsubishi 1989-1993 GALANT Service Manual page 1205

SERVICE BRAKES - Master Cylinder
SERVICE POINTS OF DISASSEMBLY
10. DISASSEMBLY OF PISTON STOPPER BOLT
Remove the piston stopper bolt, while depressing the
piston.
12. DISASSEMBLY OF PISTON STOPPER RING
Remove the piston stopper ring, while depressing the
piston.
14. DISASSEMBLY OF SECONDARY
NOTE
If it is hard to remove the secondary piston from the
cylinder, gradually apply compressed air from the outlet
port on the secondary end of the master cylinder.
INSPECTION
Check the inner surface of master cylinder body for rust or
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pitting.
Check the primary and secondary pistons for rust, scoring,
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wear, damage or wear.
Check the diaphragm for cracks and wear.
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SERVICE POINTS OF REASSEMBLY
Be sure that the primary side nipple and secondary side
nipple are not mistaken one for the other when installed.
TSB Revision