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Home >> Subaru >> 2022 >> WRX Premium, Standard Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Brake System >> Master Cylinder >> Removal >> Except For Electric Brake Booster Model

Except For Electric Brake Booster Model

CAUTION:
  • Do not allow brake fluid to come in contact with the painted surface of the vehicle body. If it does, wash off with water and wipe away completely. 
  • Prepare a container to catch grease or oil, etc. If any grease or oil spills, wipe it off and clean immediately to prevent from penetrating into floor or flowing outside. 
  • Before removing the master cylinder assembly, depress the brake pedal several times to make sure that the negative pressure in the vacuum booster assembly is completely removed. 
  • After the master cylinder assembly is removed, inspect the cylinder seal assembly and the sealing surface of the vacuum booster assembly. 
  • If the sealing surface of the vacuum booster assembly has a defect such as flaking paint, damage or rust, it may cause negative pressure leakage. Therefore, replace the vacuum booster assembly with a new part. 
  1. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  2. Remove the engine control module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
  3. Drain brake fluid completely from the oil reservoir COMPL.
  4. Remove the master cylinder assembly.
    1. Remove the hose clamp and disconnect the reservoir hose assembly.
      G14602237Courtesy of SUBARU OF AMERICA, INC.
    2. Remove the harness clip (a) from the bracket harness, and disconnect the connector (b) of the level indicator.
      G14602238Courtesy of SUBARU OF AMERICA, INC.
    3. Separate pipe assembly front ABS using a flare nut wrench.
      G14602239Courtesy of SUBARU OF AMERICA, INC.
    4. Remove the nuts, and slowly remove the master cylinder assembly from the vacuum booster assembly.
      G14602240Courtesy of SUBARU OF AMERICA, INC.