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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Transmission >> Manual Trans >> M/T Clutch System >> Clutch Fluid Air Bleeding >> Procedure >> STI Model

STI Model

NOTE: Bleed air from the oil line with help of a co-worker.
  1. Disconnect the ground cable from battery. Refer to NOTE>NOTE>BATTERY .
  2. Remove the intercooler. Refer to INTAKE (INDUCTION) (STI)>INTERCOOLER>REMOVAL .
  3. Remove the starter. Refer to STARTING/CHARGING SYSTEMS(STI)>STARTER>REMOVAL .
  4. Remove the operating cylinder.
    NOTE: Do not remove the clutch hose.
    G05003689Courtesy of SUBARU OF AMERICA, INC.
  5. Hold the piston with a clamp to prevent piston from popping out.
    G11578895Courtesy of SUBARU OF AMERICA, INC.
  6. Fit one end of a vinyl tube into the air bleeder of the operating cylinder, and put the other end into a container.
  7. Slowly depress the clutch pedal and keep it depressed. Then open the air bleeder to discharge air together with the brake fluid. Release the air bleeder for 1 or 2 seconds. Next, close the air bleeder, and slowly release the clutch pedal.
    NOTE: When performing this procedure, place the screw portion of the air bleeder higher than the end of operating cylinder.
    G13647023Courtesy of SUBARU OF AMERICA, INC.
  8. Repeat procedure 7), until there are no more air bubbles appearing from the air bleeder.
    CAUTION: Cover the air bleeder with cloth to prevent brake fluid from being splashed on surrounding parts when loosening the bleeder.
  9. Tighten the air bleeder.

    Tightening torque: 

    7.8 N.m (0.8 kgf-m, 5.8 ft-lb)

  10. Install the operating cylinder.

    Tightening torque: 

    41 N.m (4.2 kgf-m, 30.2 ft-lb)

  11. After stepping on the clutch pedal, make sure that there are no leaks evident in the entire clutch system.
  12. After bleeding the air from clutch system, ensure that the clutch operates properly.
  13. Install the starter. Refer to STARTING/CHARGING SYSTEMS(STI)>STARTER>INSTALLATION .
  14. Install the intercooler. Refer to INTAKE (INDUCTION) (STI)>INTERCOOLER>INSTALLATION .
  15. Connect the battery ground terminal. Refer to NOTE>NOTE>BATTERY .