2005-2007 Polaris Ranger 500 service manual, Page 284Get this manual
BRAKESRear Caliper Piston Bore I.DStd1.2550" (3.227 mm) Service Limit 1.256" (31.902 mm) 2Inspect piston for nicks, scratches, wear or damageMeasure diameter and replace if damaged or worn beyond service limit3
Coat the piston with clean DOT Brake Fluid (PN 2870990) or DOT Brake FluidInstall piston (B) with twisting motion while pushing inwardPiston should slide in and out of bore smoothly, with light resistanceLubricate the mounting bracket pins with Polaris Premium All Season Grease, and install the rubber dust seal boots
Polaris Premium All Season Grease (PN 2871423) Rear Caliper piston O.DStd1.250" (31.75 mm) Service Limit 1.2495" (31.737 mm)
3Inspect the brake disc and pads as outlined for brake pad replacement in this chapter4Compress the mounting bracket and make sure the dust seals are fully seatedInstall the brake padsClean the disc and pads with brake parts cleaner or denatured alcohol to remove any dirt, oil or grease