2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 363Get this manual
BRAKES Sportsman Rear Master Cylinder RemovalInstallation
1Remove the RH footwell to gain access to the rear master cylinder2Remove the rear brake lines from the master cylinderUse suitable container to catch the brake fluidDispose of brake fluid properly3Remove the two bolts that secure the rear master cylinder to the brake mount plateReplace parts as needed4To install the rear brake master cylinder, mount the master cylinder to the mount plate and torque bolts to specification5Reinstall the brake line and torque the banjo bolt to specification depending on the style of fitting