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Home >> Subaru >> 2008 >> Outback Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Brake System) >> Air Bleeding >> Procedure >> Brake Line
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Brake Line

WARNING: This page is about a different car, the 2007 Subaru Outback and 2007 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
  1. If the master cylinder is disassembled or reservoir tank is empty, bleed the master cylinder before bleeding the brake line. < Ref. to , MASTER CYLINDER , PROCEDURE, Air Bleeding. >
  2. Fulfill the reservoir tank of the master cylinder with brake fluid.
    NOTE: During the bleeding operation, keep the reservoir tank filled with brake fluid to eliminate entry of air.
  3. Fit one end of vinyl tube into the air bleeder and put the other end into a brake fluid container.
    Fig 1: Fitting Vinyl Tube Into Air Bleeder And Into Brake Fluid Container
    G03833007Courtesy of SUBARU OF AMERICA, INC.
  4. Several times depress the brake pedal and keep it.
  5. Loosen the air bleeder screws to discharge the brake fluid.

    With the air bleeder tightened quickly, release the brake pedal.

  6. Repeat the steps 4) and 5) until there are no more air bubbles in the vinyl tube.
  7. Repeat the steps above from 2) to 6) in order to bleed each wheel.
    NOTE: Perform the operation in order from the closest wheel cylinder to the master cylinder.
  8. Tighten the air bleeder screws securely.

    Tightening torque: 

    8 N.m (0.8 kgf-m, 5.8 ft-lb) 

  9. Inspect that there is no brake fluid leak evident in the entire system.
  10. Check the pedal stroke.

    While the engine is idling after warming up, depress the brake pedal with a 500 N (51 kgf, 112 lb) load and measure the distance between brake pedal and steering wheel. With the brake pedal released, measure the distance between pedal and steering wheel again.

    Fig 2: Identifying Distance Between Pedal And Steering Wheel
    G03833008Courtesy of SUBARU OF AMERICA, INC.

    Specified pedal stroke: 

    When depressing brake pedal with a 500 N (51 kgf, 112 lb) load. 

    95 mm (3.74 in) or less 

  11. If it is more than specified, there is a possibility that air is in the brake line. Bleed the brake line until pedal stroke meets the specification.
  12. Operate the hydraulic control unit in the sequence control mode. < Ref. to ABS SEQUENCE CONTROL . >
  13. Recheck the pedal stroke.
  14. If it is more than specified, there is a possibility that air is in the inside of the hydraulic unit. Repeat above steps 2) to 9) until pedal stroke meets the specification.
  15. Add brake fluid to the required level ("MAX" level) of reservoir tank.
  16. Test run the vehicle and ensure that brakes provide normal braking action.
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