1999-2004 Honda TRX400EX FourTrax Service Manual, Page 211Get this manual
HYDRAULIC DISC BRAKE
INSPECTION
Check the piston cups for wear, deterioration or damageCheck the spring for damageCheck the master cylinder and piston for scoring, scratches or damageMeasure the maser cylinder I.DSERVICE LIMIT 12.75 mm 10.502 in) Measure the master piston O.DSERVICE LIMIT 12.65 mm 10.498 in1
ASSEMBLY
MASTER CYLINDER
PUSH ROD