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Home >> Subaru >> 2019 >> WRX Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System >> Rear Disc Brake Assembly >> Disassembly >> STI Model

STI Model

CAUTION:
  • Be careful not to allow foreign matter to enter the brake hose connector.
  • Since the 18-inch (Brembo) caliper body is easily scratched and the paint may be stripped, protect it from being contacted with other parts or tools.
  1. Remove mud and foreign matter from the caliper body assembly.
  2. Remove the piston boot.
    NOTE: Remove two piston boots.
    G12448183Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the piston - disc brake.
    1. Place a wooden block in the caliper body assembly as shown in the figure to prevent the piston-disc brake from jumping out and being damaged.
    2. Using an air gun, gradually apply compressed air via the brake hose installation hole to push out the piston - disc brake.
      NOTE: Instead of removing the pistons one by one, remove all pistons at once after adjusting the amount of protrusion evenly using a wooden block.
    G12448184Courtesy of SUBARU OF AMERICA, INC.
  4. Remove the piston seal.
    CAUTION: Do not damage the piston sliding part and the piston seal groove.
    NOTE: Remove two piston seals.
    G12448185Courtesy of SUBARU OF AMERICA, INC.
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