2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 171Get this manual
BRAKES 6Measure the thickness of the pad materialReplace pads if worn beyond the service limitPolaris Premium All Season Grease (PN 2871423) 2Compress mounting bracket and make sure dust boots are fully seatedInstall pads with friction material facing each otherBe sure pads and disc are free of dirt or grease
Measure Thickness 3Install caliper on hub strut, and torque mounting bolts
Front Brake Pad Thickness New .2987.6 mm Service Limit .1804.0 mm