Rear Disc Rotor: Removal

Lift up the vehicle, then remove the rear wheels.
Release the parking brake.
Remove the two mounting bolts, and remove the disc brake assembly.

Fig 1: Locating Mounting Bolts
Courtesy of SUBARU OF AMERICA, INC.
Suspend the disc brake assembly so that the hose is not stretched.
Remove the disc rotor.
NOTE: If it is difficult to remove the disc rotor, perform the following two methods in order.
1. Turn the adjusting screw using a flat tip screwdriver until the brake shoe is far enough away to allow removal of the disc rotor.
  
  Fig 2: Turning Adjusting Screw Using Flat Tip Screwdriver
  Courtesy of SUBARU OF AMERICA, INC.
2. If it is difficult to remove the disc rotor from the hub, drive an 8 mm bolt into the threads B of the rotor, then remove the rotor.
  
  Fig 3: Identifying Disc Rotor
  Courtesy of SUBARU OF AMERICA, INC.