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Home >> Subaru >> 2016 >> Crosstrek Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Brake System) >> Air Bleeding >> Procedure >> Brake Line

Brake Line

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek and 2015 Subaru Impreza. 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 One End Of Vinyl Tube To Bleeder And Brake Fluid Container
    G08314865Courtesy of SUBARU OF AMERICA, INC.
  4. Loosen the bleeder - screw, and repeat the procedure of depressing the brake pedal to its full stroke 20 times or more until there are no air bubbles in the brake fluid in the clear vinyl tube.
  5. Tighten the loosened bleeder - screw, firmly depress the brake pedal five to six times and hold it.
  6. Loosen the bleeder - screw, and drain the brake fluid. When the brake pedal reaches to its full stroke, quickly retighten the bleeder - screw, and release the brake pedal.
  7. Repeat the steps  5 and  6 until there are no air bubbles in the clear vinyl tube.
  8. Perform the steps described in  2 through  7 for each caliper.
    NOTE: Bleed air in the order starting from the brake caliper farthest from the master cylinder assembly.

    Rear LH → rear RH → front LH → front RH

  9. Tighten the bleeder - screw to the specified torque.

    Tightening torque: 

    Bleeder - screw: 8 N.m (0.82 kgf-m, 5.9 ft-lb) 

  10. Check that there are no brake fluid leakage at the flare nut portion or the entire brake system.
  11. Perform the ABS and VDC sequence control modes both for the hydraulic control unit.
    NOTE:
    • The normal bleeding operation cannot remove air that entered into the pressure control area of hydraulic control unit. By performing the sequence control, air in the pressure control area moves to the pass for normal bleeding operation.
    • When air entry in the pressure control area of hydraulic control unit is suspected (ex. VDC or ABS operated while air existed in the pass for normal bleeding operation), perform the ABS and VDC sequence control modes both.
  12. Perform the bleeding procedure from step  2 through  10 again.
  13. Fill the reservoir tank with brake fluid up to the "MAX" level.
  14. Perform a road test and ensure that the brakes operate normally.
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