Brake Line

WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

When the master cylinder is disassembled or the reservoir tank is empty, bleed the master cylinder before bleeding the brake line. < Ref. to MASTER CYLINDER , PROCEDURE, Air Bleeding. >
Fill the reservoir tank of the master cylinder with brake fluid.
NOTE: While bleeding air, keep the reservoir tank filled with brake fluid to prevent entry of air.
Attach one end of the vinyl tube to the air bleeder and the other end to the brake fluid container.
Depress the brake pedal several times, and hold it.
Loosen the air bleeder screw to drain brake fluid. Tighten the air bleeder quickly, and release the brake pedal.
NOTE:
- Bleed air in order starting from the wheel cylinder farthest from the master cylinder.
- 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.

Fig 1: Identifying Inner And Outer Side Air Bleeder Screw
Courtesy of SUBARU OF AMERICA, INC.
Repeat the steps 4) to 5) until there are no more air bubbles in the vinyl tube.
Repeat the steps from 2) to 6) above to bleed air from each wheel.
Securely tighten the air bleeder screws.
Tightening torque:

Brembo type

20 N.m (2.04 kgf-m, 14.5 ft-lb)

Except for 1 brembo type

8 N.m (0.82 kgf-m, 5.9 ft-lb)
Check that there are no brake fluid leaks in the entire system.
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 lbf). Measure the distance between the brake pedal and steering wheel. Release the pedal, and measure the distance between pedal and steering wheel again.

Fig 2: Identifying Steering Wheel And Toe Board
Courtesy of SUBARU OF AMERICA, INC.

Specification of pedal stroke:

When depressing the pedal with a force of 500 N (51 kgf, 112 lbf).

110 mm (4.33 in) or less
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.
Operate the hydraulic control unit in the sequence control mode. < Ref. to ABS SEQUENCE CONTROL . >
Check the pedal stroke again.
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.
Fill the reservoir tank with brake fluid up to the "MAX" level.
Test run the vehicle and ensure that the brakes operate normally.