2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 271Get this manual
[ BRAKE SYSTEM
Be careful not to damage the piston sliding surfacePush the dust seals and piston seals in and tift them PISTON
outClean the seal grooves, caliper pistons and caliper piston sliding surfaces with clean brake fluid
DUST SEAL
INSPECTION
Check the caliper cylinder and pistons for scoringscratches or damageMeasure the caliper cylinder 1.0SERVICE LIMIT: 34.020 mm {1.3394 in )
Measure the caliper piston 0.0
SERVICE LIMIT: 33.870 mm 11 .3335 inl