1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 267Get this manual
BR.AKE SYSTEM Remove the oi sealpisto and sprin gClean the inside the cyl inder and rese rvoir wHh brake tluidCheck th,e oi seal, iston boot, prlmary cup al1d seoondary cup for fatigue or damage, Check the master cy linder and piston for abnorma1 se r.a te hes,
PR IMARY CUP
SECONDARY CUP
INSPECTION
Measure the master cylinder LD
S!ERVICE UMII14,055 mm (0.553 in) T
Measure the master cylinder piston 0.0SERVICE lIIMI1: 13,945 mm (0.5490 ii'll
ASSEMBLY