1999-2002 TRX400EX Fourtrax Service Manual, Page 208Get this manual
HYDRAULIC DISC BRAKE
INSPECTION
Check the caliper cylinder and piston for scoring, scratches damageMeasurethe caliper cylinder 1.0
SERVICE LIMIT: 34.02 mm (1.340 in)
Measurethe caliper piston 0.0
SERVICE LIMIT 33.87 mm (1.333 in)
ASSEMBLY
DUST PLUG
DUST SEAL SLIDE PIN