2009 Polaris Outlaw 450/525 Service Manual, Page 152Get this manual
BRAKES 4Clean the caliper body, piston, and retaining bracket with brake cleaner or alcohol2Inspect piston for nicks, scratches, wear or damageMeasure diameter and replace if damaged or worn beyond service limit
Clean Components
Inspect the brake disc and pads as outlined for brake pad replacement in this sectionSee "Brake Pad Inspection" in this chapter
NOTE: Be sure to clean seal grooves in caliper body
= In mmCaliper Piston O.D Std: 1.186" (30.12 mm) Service Limit: 1.184" (30.07 mm)
Caliper Inspection
1Inspect caliper body for nicks, scratches or wearMeasure bore size and compare to specificationsReplace if damage is evident or if worn beyond service limit