1995-2003 Honda Foreman TRX400FW TRX400 TRX 400 400FW Service Manual, Page 252Get this manual
BRAKE SYSTEM WHEEL INSPECTION
Disassemble Ilia wheel cylioOe' assembly Bnd BInspeCt 1111 whMlI cylinde, bore aod pismn lor 1C00inggroovingInspeCt tile pi&lon cup and piston boot weB' faligueInspect thl adjull body nd adjuster nut lor wea, or damageCllack Ihe lock spring for fatigue or damage
LOCK SPRING
Me.sure the wIIeel cyiind 1.0SERVICE UMIT: 17.515 mm (0.6896 In)
MII.sure the wheel cvlinclet piston .0SERVICE UMIT: 17.405 mm (0.6852 in )