2005-2007 Polaris Ranger 500 service manual, Page 285Get this manual
BRAKES REAR BRAKE DISC
Disc Inspection
12Visually inspect disc for scoring, scratches, or gougesReplace the disc if any deep scratches are evidentUse 0-1"micrometer and measure disc thickness at different points around perimeter of discReplace disc if worn beyond service limitRear Brake Disc
TROUBLESHOOTING
Brakes SquealPoor Brake Performance
Air in system Water in system (brake fluid contaminated) Caliperdisc misaligned Caliper dirty or damaged Brake line damaged or lining ruptured Worn disc andor friction pads Incorrectly adjusted stationary pad Worn or damaged master cylinder or components Damaged break pad noise insulator
Pedal Vibration
Disc damaged Rear Brake Disc Measure Thickness Front View of Brake Disc Disc worn (runout or thickness variance exceeds service limit)
Caliper Overheats (Brakes Drag)