AutoZone 2005 Chevrolet Truck Blazer 2WD 4.3L SFI OHV 6cyl | Repair Guides | Brakes | Bleeding The Brake System | Bleeding The Brake System | AutoZone.com

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    2005 Chevrolet Truck Blazer 2WD 4.3L SFI OHV 6cyl

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    Lincoln Blackwood, Ford F-Series Pick-ups, Lincoln Mark LT 2001-2006

    Bleeding the Brake System

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    1. Before servicing the vehicle, refer to the Precautions Section.
      NOTE
      When any part of the hydraulic system has been disconnected for repair or new installation, air may get into the system and cause spongy brake pedal action. This requires bleeding of the hydraulic system after it has been correctly connected. The hydraulic system can be gravity bled, manually bled or with pressure bleeding equipment.

    2.  

    Master Cylinder, Bench

    1. Support the brake master cylinder body in a vise and fill the brake master cylinder reservoir with specified brake fluid.
      NOTE
      Original equipment lines are not intended to be used during this procedure.

    2.  
    3. Install short brake tubes with the ends submerged in the brake master cylinder reservoir.
    4.  
    5. Slowly press the primary piston until clear fluid flows from both brake tubes, without air bubbles.
    6.  
    7. Remove the short brake tubes and plug the brake tube ports.
    8.  

    Master Cylinder-In Vehicle


    WARNING
    Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.


    NOTE
    When a new brake master cylinder has been installed or the system has been emptied, or partially emptied, it should be primed to prevent air from getting into the system.

    1. Disconnect the brake master cylinder outlet tubes.
      NOTE
      Original equipment lines are not intended to be used during this procedure.

    2.  
    3. Install short brake tubes with ends submerged in the brake master cylinder reservoir and fill the brake master cylinder reservoir with brake fluid.
    4.  
    5. Have an assistant pump the brake pedal until clear fluid flows from both brake tubes without air bubbles.
    6.  
    7. Remove the short brake tubes and install the brake outlet tubes.
    8.  
    9. Bleed each brake tube at the brake master cylinder as follows:
      1. Have an assistant pump the brake pedal and then hold firm pressure on the brake pedal.
      2.  
      3. Loosen the rear brake tube fittings until a stream of brake fluid comes out. Have an assistant maintain pressure on the brake pedal while tightening the brake tube fitting.
      4.  
      5. Repeat this operation until clear, bubble-free fluid comes out.
      6.  
      7. Refill the brake master cylinder reservoir as necessary. Repeat the bleeding operation at the front brake tube.
      8.  

    10.  
    11. While the assistant maintains pressure on the brake pedal, tighten the brake tubes.
    12.  

    Gravity Bleeding


    WARNING
    Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.


    NOTE
    When a new brake master cylinder has been installed or the system has been emptied, or partially emptied, it should be primed to prevent air from getting into the system.

    1. Fill the brake master cylinder reservoir with brake fluid.
    2.  
    3. Connect a clear tube to the right rear disc brake caliper bleeder screw and the other end in a container partially filled with recommended brake fluid.
    4.  
    5. Open the bleeder screw and leave open until clear bubble-free brake fluid flows.
    6.  
    7. Refill the brake master cylinder reservoir as necessary.
    8.  
    9. Tighten the disc brake caliper bleeder screw.
    10.  
    11. Repeat Steps 1 through 4 for the three remaining brake calipers, going in order from the left rear disc brake caliper to the right front disc brake caliper ending with the left front disc brake caliper.
    12.  
    13. If the brake pedal feels spongy, repeat the bleed procedure.
    14.  

    Manual Bleeding


    WARNING
    Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.

    1. Fill the brake master cylinder reservoir with brake fluid.
    2.  
    3. Connect a clear tube to the right rear disc brake caliper bleeder screw and the other end in a container partially filled with recommended brake fluid.
    4.  
    5. Have an assistant pump the brake pedal and then hold firm pressure on the brake pedal.
    6.  
    7. Loosen the disc brake caliper bleeder screw until a stream of brake fluid comes out. Have an assistant maintain pressure on the brake pedal while tightening the disc brake caliper bleeder screw. Repeat until clear, bubble-free fluid comes out. Refill the brake master cylinder reservoir as necessary.
    8.  
    9. Tighten the disc brake caliper bleeder screw.
    10.  
    11. Repeat Steps 1 through 5 for the three remaining brake calipers, going in order from the left rear disc brake caliper to the right front disc brake caliper ending with the left front disc brake caliper.
    12.  
    13. If the brake pedal feels spongy, repeat the bleed procedure.
    14.  

    Anti-Lock Brake System Hydraulic Control Unit Bleeding


    NOTE
    This procedure is only required when a new hydraulic control unit is installed.

    1. Connect diagnostic tool Worldwide Diagnostic System (WDS) 418-F224, New Generation STAR (NGS) Tester 418-F052, or equivalent diagnostic tool and follow the ABS system bleed instructions.
    2.  
    3. Use the gravity bleed or manual bleed procedure(s) to bleed the system. Begin at the right rear caliper.
    4.  

     
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