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Home >> Subaru >> 2022 >> WRX Premium, Standard Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Brake System >> Brake Booster >> 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. 
  • Before handling the airbag system components, refer to "CAUTION" of "General Description" in "AIRBAG SYSTEM". Ref. to  AIRBAG SYSTEM>GENERAL DESCRIPTION>CAUTION  . 
  • If the master cylinder assembly has been removed, inspect the sealing surfaces of the cylinder seal assembly and 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. 
  • Do not disassemble the vacuum booster assembly. 
  • Make sure that the booster shell and vacuum pipe are not subject to strong impacts. 
  • Be careful not to drop the vacuum booster assembly. If the vacuum booster assembly is dropped accidentally, replace it. 
  • Place the removed vacuum booster assembly as shown in the figure below and be careful not to apply a force (a) from above. If a force (a) from above is applied, the resin (b) may become damaged. 
G14602255Courtesy of SUBARU OF AMERICA, INC.
  1. Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  2. Remove the intercooler. Ref. to INTAKE (INDUCTION) (H4DOTC)>INTERCOOLER>REMOVAL .
  3. Remove the engine control module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
  4. Remove the hose clamp and disconnect the vacuum hose COMPL.
    G14602256Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the master cylinder assembly. Ref. to BRAKE>MASTER CYLINDER>REMOVAL>EXCEPT FOR ELECTRIC BRAKE BOOSTER MODEL .
  6. Disconnect the vacuum sensor assembly connector.
    CAUTION:
    • Do not remove the vacuum sensor assembly. If removed, replace the vacuum booster assembly with a new part. 
    • Do not rotate the vacuum sensor assembly when disconnecting the connector of vacuum sensor assembly. Otherwise the grommet on the mounting location of the vacuum sensor assembly may be damaged. 
    G14602257Courtesy of SUBARU OF AMERICA, INC.
  7. Remove the clutch pipe. Ref. to CLUTCH SYSTEM>CLUTCH PIPE AND HOSE>REMOVAL .
  8. Remove the pipe assembly front ABS.
    1. Separate pipe assembly front ABS using a flare nut wrench.
    2. Release the pipe clamps, and remove the pipe assembly front ABS.
    G14602258Courtesy of SUBARU OF AMERICA, INC.
  9. Remove the cover LWR driver. Ref. to EXTERIOR/INTERIOR TRIM>INSTRUMENT PANEL LOWER COVER>REMOVAL .
  10. Remove the knee airbag module. Ref. to AIRBAG SYSTEM>KNEE AIRBAG MODULE>REMOVAL .
  11. Remove the duct foot driver. Ref. to AIR CONDITIONER>AIR VENT DUCT>REMOVAL>FOOT DUCT .
  12. Remove the snap pin (a) and clevis pin (b), and remove the operating rod from the pedal COMPL brake.
    CAUTION:
    • Be careful not to apply excessive force to the operating rod when handling the operating rod. The angle may change by ±3°, and it may result in damage to power piston cylinder. 
    • Do not change the push rod length. 
    G14602259Courtesy of SUBARU OF AMERICA, INC.
  13. Remove the nuts, and then remove the vacuum booster assembly.
    G14602260Courtesy of SUBARU OF AMERICA, INC.
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