1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 119Get this manual
BRAKE SERVICE Type II Hydraulic Caliper Service Front Also 4x6 and 6x6 Rear Cleaning And Inspecting
Check all parts for wear or damage and replace any found defective1Clean all parts, except brake pads, with denatured alcohol and wipe dry with clean, lint-free clothUsing an air hose, blowout the drilled passages and bores2Inspect casting cylinder bore for scoring, pitting, or corrosionA corroded or deeply scored casting should be replaced; light scores and stains may be removed3Polish any discolored or stained areas with crocus cloth onlyUse finger pressure and rotate the crocus cloth in the cylinder boreDo not slide the cloth in and out of the bore under pressureDo not use any other kind of abrasive or abrasive cloth