2008 Polaris ATV Outlaw 450/525 Service Manual, Page 154Get this manual
BRAKES Disc RemovalReplacement ("MXR""S")
See Chapter "REAR AXLE SERVICE "MXR""S" RemovalDisassembly" for rear brake disc removal7Remove brake disc mounting bolts (4)
Disc RemovalReplacement ("IRS")
1234With ATV on the ground, loosen wheel nuts and hub nutsSafely lift and support the rear of the ATV under the main frameRemove right rear wheel and hubRemove rear caliper and secure out of the way8Lift and rotate disc, slipping it over the hub assembly and off the drive shaft, exiting the frame from the side