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Home >> Subaru >> 2015 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Brake System) >> Air Bleeding >> Procedure >> Brake Line
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Brake Line

WARNING: This page is about a different car, the 2015 Subaru Outback and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
  1. When the master cylinder assembly is replaced or the reservoir tank is empty, bleed the master cylinder assembly before bleeding the brake line. <Ref. to MASTER CYLINDER , PROCEDURE, Air Bleeding.>
  2. Fill the reservoir tank of the master cylinder assembly with brake fluid.
    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 bleeder - screw and the other end to the brake fluid container.
    Fig 1: Attaching Vinyl Tube To Bleeder Screw
    G10276727Courtesy of SUBARU OF AMERICA, INC.
  4. Depress the brake pedal several times, and hold it.
  5. Loosen the bleeder - screw to drain brake fluid. Tighten the bleeder - screw quickly, and release the brake pedal.
  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.
    NOTE: Perform air bleed starting in the order from the farthest wheel cylinder from the master cylinder assembly.
  8. Securely tighten the bleeder - screw.

    Tightening torque: 

    Front bleeder - screw: 8 N.m (0.8 kgf-m, 5.9 ft-lb) 

    Rear bleeder - screw: 17 N.m (1.7 kgf-m, 12.5 ft-lb) 

  9. Check that there are no brake fluid leaks in the entire brake system.
  10. Check the pedal stroke.
    1. Warm up the engine until the engine speed stabilizes.
    2. Depress and hold the brake pedal with a force of 500 N (51 kgf, 112 lbf).
    3. Adjust the tilt position of the steering wheel to the lowest position.
    4. Measure the distance between brake pedal and steering wheel.
    5. Release the pedal, and measure the distance between pedal and steering wheel again.
      Fig 2: Measuring Distance Between Pedal And Steering Wheel
      G10276728Courtesy of SUBARU OF AMERICA, INC.

      Specification of pedal stroke: 

      110 mm (4.33 in) or less when depressing the pedal with a force of 500 N (51 kgf, 112 lbf) 

  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. <Ref. to ABS SEQUENCE CONTROL .>
  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. Perform a road test and ensure that the brakes operate normally.
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