2005 Polaris Sportsman 400/500 Service Manual, Page 252Get this manual
BRAKE BURNISHING PROCEDURE
It is required that burnishing procedure be performed after installation of new brake pads to extend service life and reduce noiseStart machine and slowly increase speed to 30 mphGradually apply brakes to stop machineAllow pads and disc to cool sufficiently during the procedureDo not allow pads or disc to become hot or warpage may resultRepeat this procedure 10 times
4Remove caliper mounting bolts and lift caliper off of discNOTE: When removing caliper, be careful not to damage brake lineSupport caliper so as not to kink or bend brake line