2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 272Get this manual
HYDRAULIC DISC BRAKE INSPECTION Check the caliper cylinder and piston for scoring scratches or damage Measure the ca liper cylinder 1.0SERVICE LIMIT: 34.02 mm (1.340 in) Measure the caliper piston 0.0SERVICE LIMIT: 33.87 mm (1.333 in)
ASSEMBLY
PAD PISTON SEAL DUST SEAL
PIN PLUGS RUBBER CAP
CALIPER PISTON
SLIDE PIN