1998-2004 Honda Foreman 450 factory service manual, Page 278Get this manual
BRAKE SYSTEM Remove the oil seal, piston and springClean the inside of the cylinder and reservoir with brake fluidCheck the oil seal, piston boot, primary cup and secondary cup for fatigue or damageCheck the master cylinder and piston for abnormal scratches
PRIMARY
SECONDARY CUP
INSPECTION
Measure the master cylinder 1.0SERVICE LIMIT: 14.055 mm (0.5533 in)
Measure the master cylinder piston 0.0SERVICE LIMIT: 13.945 mm (0.5490 in)
ASSEMBLY