2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 177Get this manual
BRAKES 9Repeat the procedure on the two remaining front calipers4510Add DOT brake fluid to .25".30" (6mm) from the top of the reservoir11Install diaphragm, cover and screwsTorque the screws to inlbs(.8 Nm)Hand Master Cylinder Using funnel, add brake fluid to the MAX level mark on the reservoirInstall box end wrench on the rear caliper bleeder screwAttach clean, clear hose to fitting and place the other end in containerBe sure the hose fits tightly on fittingBleeder Screw
7 inlbs(.8 Nm) 67Rear Brake System Bleeding Locate the fluid reservoir for the foot master cylinder (see the following illustration)Sportsman 400 H.O
12Proceed to "Rear Brake System Bleeding" to complete bleeding procedure
Slowly pump the foot brake pedal until pressure builds and holdsWhile maintaining pedal pressure, open bleeder screwClose bleeder screw and release brake pedalNOTE: Do not release pedal 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 reservoir