Rear Disc Rotor: Removal

Lift-up the vehicle, and then remove the wheels.
Pull down and release the parking brake.
Remove the two mounting bolts, and then remove the disc brake assembly.

Fig 1: Removing Mounting Bolts
Courtesy of SUBARU OF AMERICA, INC.
Suspend the disc brake assembly so that hose is not stretched.
Remove the disc rotor.
NOTE: If the disc rotor is difficult to remove try following two methods in order.
1. Turn the adjusting screw using a flat tip screwdriver until brake shoe gets away enough from the disc rotor.
  
  Fig 2: Turning Adjusting Screw
  Courtesy of SUBARU OF AMERICA, INC.
2. If the disc rotor seizes up within hub, drive the disc rotor out by installing an 8 mm bolt in holes B on rotor.
  
  Fig 3: Identifying Disc Rotor Seizes
  Courtesy of SUBARU OF AMERICA, INC.