Impreza WRX STI F4-2.5L Turbo (2008)
NOTE: While bleeding air, keep the reservoir tank filled with brake fluid to prevent entry of air.
3) Attach one end of the vinyl tube to the air bleeder and the other end to the brake fluid container.
4) Depress the brake pedal several times, and hold it.
5) Loosen the air bleeder screw to drain brake fluid. Tighten the air bleeder quickly, and release the brake pedal.
NOTE:
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Bleed air in order starting from the wheel cylinder farthest from the master cylinder.
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For calipers with two air bleeder screws, bleed air from the inner side first and then the outer side. Repeat this operation at least twice.
6) Repeat the steps 4) to 5) until there are no more air bubbles in the vinyl tube.
7) Repeat the steps from 2) to 6) above to bleed air from each wheel.
8) Securely tighten the air bleeder screws.
Tightening torque: 20 Nm (2.0 kgf-m, 14.5 ft. lbs.)
9) Check that there are no brake fluid leaks in the entire system.
10) Check the pedal stroke. Run the engine at idle after warming up the engine, and depress the brake pedal with a force of 500 N (51 kgf, 112 lbs.).
Measure the distance between the brake pedal and steering wheel. Release the pedal, and measure the distance between pedal and steering wheel
again.
Specification of pedal stroke: When depressing the pedal with a force of 500 N (51 kgf, 112 lbs.). 95 mm (3.74 inch) or less
11) If the distance is more than specification, there is a possibility of air being caught in the brake line. Bleed the brake line of all air until the pedal
stroke meets the specification.
12) Operate the hydraulic control unit in the sequence control mode.
13) Check the pedal stroke again.
14) If the distance is more than specification, there is a possibility of air being caught in the hydraulic unit. Repeat above steps 2) to 9) until the pedal
stroke meets the specification.
15) Fill the reservoir tank with brake fluid up to the "MAX" level.
16) Test run the vehicle and ensure that the brakes operate normally.
