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Electric Brake Booster Model

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Before handling the airbag system components, refer to "CAUTION" of "General Description" in "AIRBAG SYSTEM". Ref. to  AIRBAG SYSTEM>GENERAL DESCRIPTION>CAUTION  . 
  • When the electric booster assembly is replaced, be sure to perform the module registration. 
  1. Check the operating rod of the electric booster assembly.
    1. Check the length (a) between the electric booster assembly mounting surface and clevis pin hole.

      Specification: 

      141.3 mm (5.56 in)

      G14602274Courtesy of SUBARU OF AMERICA, INC.
    2. If the inspection result is not within the standard value, loosen the lock nuts of operating rod, and rotate the rod to adjust the length within the specification.
    3. Tighten the lock nut.
    NOTE:

    Check the brake pedal height. When adjusting, also adjust the stop light switch assembly. 

    Tightening torque: 

    18 N.m (1.8 kgf-m, 13.3 ft-lb)

  2. Install the master cylinder assembly. Ref. to BRAKE>MASTER CYLINDER>INSTALLATION>ELECTRIC BRAKE BOOSTER MODEL .
  3. Install the electric booster assembly.
    CAUTION:
    • Replace gasket A and gasket B with new parts. 
    • Use a wobble extension for torque tightening to prevent interference with the column assembly steering. 

    Tightening torque: 

    18 N.m (1.8 kgf-m, 13.3 ft-lb)

  4. Install the operating rod to the pedal COMPL brake.
    1. Apply a thin coat of grease to the new clevis pin.

      Preparation items: 

      Grease: NIPPON GREASE NIGTIGHT LTS No. 2 or equivalent

      G14602272Courtesy of SUBARU OF AMERICA, INC.
    2. Using a clevis pin and a snap pin, install the operating rod to the pedal COMPL brake.
  5. Install the duct foot driver. Ref. to AIR CONDITIONER>AIR VENT DUCT>INSTALLATION>FOOT DUCT .
  6. Install the knee airbag module. Ref. to AIRBAG SYSTEM>KNEE AIRBAG MODULE>INSTALLATION .
  7. Install the cover LWR driver. Ref. to EXTERIOR/INTERIOR TRIM>INSTRUMENT PANEL LOWER COVER>INSTALLATION .
  8. Install the pipe assembly front ABS using a flare nut wrench and a crowfoot wrench.
    NOTE:

    If the work can be performed with the front and back sides reversed, it is also possible to use a 6-point crowfoot wrench. 

    Tightening torque: 

    Calculation formula

    T = 19 N.m (1.9 kgf-m, 14.0 ft-lb) x L1/(L1 + L2)

    T: Reading of the torque wrench

    L1: Effective length of the torque wrench

    L2: Effective length of the crowfoot wrench

    NOTE:

    If the effective length of the tool used is unknown, consult the manufacturer of the tool. 

    G14602276Courtesy of SUBARU OF AMERICA, INC.
  9. Connect each connector.
  10. Install the engine control module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>INSTALLATION .
  11. Install the intercooler. Ref. to INTAKE (INDUCTION) (H4DOTC)>INTERCOOLER>INSTALLATION .
  12. Bleed air from the brake system. Ref. to BRAKE>AIR BLEEDING>PROCEDURE .
  13. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  14. When the electric booster assembly is replaced, perform the module registration. Ref. to COMMON (DIAGNOSTICS)>UNIT REGISTRATION>OPERATION .
  15. Perform a road test to make sure the brakes do not drag.
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