1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 252Get this manual
BRAKE SYSTEM Remove the oil seal, piston and spring Clean the inside of the cylinder and reservoir with brake fluidCheck the oil seal, piston bootprimary cup and secondary cup for fatigue or damageCheck the master cylinder and piston for abnormal scratches
PRIMARY CUP OIL SEAL
SECONDARY CUP
INSPECTION
Measure the master cylinder IDSERVICE LIMIT: 12.755 rnm (0.5022 in)
Measure the master cylinder piston ODSERVICE LIMIT: 12.645 mm (0.4978 int