Rear Disc Brake Assembly: Disassembly

CAUTION: Be careful not to allow foreign matter to enter the brake hose connector.

Remove mud and foreign matter from the caliper body.
Remove the piston boot from caliper body cylinder.

Fig 1: Removing Piston Boot From Caliper Body Cylinder
Courtesy of SUBARU OF AMERICA, INC.
Remove the piston.
1. Place a wooden block in the caliper body as shown in the figure to prevent the piston from jumping out and being damaged.
2. Using an air gun, gradually apply compressed air via the brake hose installation hole to push the piston out.
  
  Fig 2: Removing Piston Using Compressed Air
  Courtesy of SUBARU OF AMERICA, INC.
Remove the piston seal from caliper body cylinder.
CAUTION: Do not damage the cylinder and piston seal groove.

Fig 3: Removing Piston Seal From Caliper Body Cylinder
Courtesy of SUBARU OF AMERICA, INC.
Remove the guide pin, lock pin, bushing pin, and pin boot from the support.

Fig 4: Identifying Guide Pin, Lock Pin, Bushing Pin And Pin Boot
Courtesy of SUBARU OF AMERICA, INC.