2015 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Front Disc Brake Assembly: Disassembly

WARNING: This page is about a different car, the 2015 Subaru Outback and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Be careful not to allow foreign matter to enter the brake hose connector.
  1. Remove mud and foreign matter from the caliper body assembly.
  2. Remove the piston - disc brake.
    1. Place a wooden block in the caliper body 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.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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