2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 336Get this manual
BRAKES 11Add Polaris DOT-approved Brake Fluid to MAX level inside reservoir14Torque the screw to specification in.lbs(0.79 Nm)
Torque Inner Bolt First
12Install diaphragm, sight glass, cap and screwsMaster Cylinder Cap
Master Cylinder Cover Screw Torque: in.lbs(0.79 Nm) 15Field test machine at low speed before putting into serviceCheck for proper braking action and lever reserveWith lever firmly applied, lever reserve should be no less than 12", (1.3 cm) from handlebar16Check brake system for fluid leaks and inspect all hoses and lines for wear or abrasionReplace hose if wear or abrasion is found