2005 Polaris Sportsman 400/500 Service Manual, Page 241Get this manual
BRAKES Brake Noise Troubleshooting
Possible Cause Dirt, dust, or imbedded material on pads or disc Remedy Spray disc and pads with CRC Brake Kleent or equivalent non-flammable aerosol brake cleanerRemove pads andor disc hub to clean imbedded material from disc or padsAdjust pad stop (front calipers) Check position of controlsswitchesSet to proper level Clean compensating port InspectRepair as necessary Clean piston(s) seal
HYDRAULIC BRAKE SYSTEM OPERATION OVERVIEW
Typical Hydraulic Brake System Compensating port compensates Must be clear for temperature to allow changes by allowproper diaing fluid back to phragm moveC master cylinder ment F