Except For STI Model

NOTE: Bleed air from the oil line with help of a co-worker.

Remove the intercooler. <Ref. to REMOVAL , Intercooler.>
Fit one end of a vinyl tube into the air breather of the operating cylinder, and put the other end into a clutch fluid container.

Fig 1: Fitting Vinyl Tube End Into Air Breather Of Operating Cylinder
Courtesy of SUBARU OF AMERICA, INC.
Slowly depress the clutch pedal several times and keep it depressed. Open the air breather to discharge air together with the clutch fluid. Release the air breather for 1 or 2 seconds. Next, close the air breather, and slowly release the clutch pedal.
CAUTION: Cover the air breather with cloth to prevent clutch fluid from being splashed on surrounding parts when loosening the breather.

Fig 2: Identifying Operating Cylinder And Vinyl Tube
Courtesy of SUBARU OF AMERICA, INC.
Repeat procedure 3), until there are no more air bubbles appearing from the air breather.
Tighten the air breather.
Tightening torque:

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

Fig 3: Identifying Air Breather
Courtesy of SUBARU OF AMERICA, INC.
After stepping on the clutch pedal, make sure that there are no leaks evident in the entire clutch system.
After bleeding the air from clutch system, ensure that the clutch operates properly.
Install the intercooler. <Ref. to INSTALLATION , Intercooler.>