2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 311Get this manual
BRAKE BLEEDINGFLUID CHANGE CONT7Slowly pump brake lever (D) until pressure builds and holds8While maintaining lever pressure, open bleeder screwClose bleeder screw and release brake leverNOTE: Do not release lever before bleeder screw is tight or air may be drawn into caliper9Repeat procedure until clean fluid appears in bleeder hose and all air has been purgedAdd fluid as necessary to maintain level in reservoirCAUTION: Maintain at least 12 (1.27 cm) of brake fluid in the reservoir to prevent air from entering the master cylinder10Tighten bleeder screw securely and remove bleeder hose11Repeat procedure steps 5-9 for the remaining caliper(s)12Add brake fluid to MAX level inside reservoir