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    1998 Chevrolet Truck Blazer 4WD 4.3L SFI 6cyl

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    Ford Thunderbird/Cougar 1983-1997 Repair Guide

    Bleeding The ABS System

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    CAUTION
    The 4-Wheel Anti-Lock brake system is under high accumulator hydraulic pressure most of the time. Before servicing any component which contains high pressure, it is mandatory that the high pressure in the system be discharged.

    SYSTEM DISCHARGING (DEPRESSURIZING)



    Turn the ignition to the OFF position. Pump the brake pedal a minimum of 20 times until an increase in pedal force is clearly felt.

    FRONT BRAKE BLEEDING



    The front brakes can be bled in the conventional manner, with or without the accumulator being charged. Refer to the previous brake bleeding section at the beginning of this Section for instructions.

    REAR BRAKE BLEEDING



    A fully charged accumulator is required for successful rear brake system bleeding. Once accumulator pressure is applied to the system, the rear brakes can be bled by opening the rear caliper bleeder screw while holding the brake pedal in the applied position with the ignition switch in the Run position. Repeat the procedure until an air-free flow of brake fluid comes from the bleeder screw. Close the bleeder screw. Add fluid to the master cylinder reservoir until required level is reached.


    CAUTION
    Care must be used when opening the bleeder screws. The fluid is under high pressure and could cause injury if splashed into eyes, etc.

    BLEEDING THE SYSTEM WITH A FULLY CHARGED ACCUMULATOR



    1. Remove the dust cap from the right side rear caliper bleeder fitting. Attach a rubber drain tube to the fitting making sure the end of the tube fits snugly around the fitting.
    2.  
    3. Turn the ignition switch to the RUN position. This will turn on the electric pump to charge the accumulator as required.
    4.  
    5. Hold the brake pedal in the applied position. Open the right side rear caliper bleeder fitting for 10 seconds at a time until an air-free stream of brake fluid is observed.
    6.  


    WARNING
    Be very careful when opening the bleeder screws due to the high pressure available from a fully charged accumulator.

    1. Repeat the procedure at the left side rear caliper.
    2.  
    3. Pump the brake pedal several times to complete the bleeding procedure and to fully charge the accumulator.
    4.  
    5. Adjust the fluid level in the reservoir to the MAX mark with a fully charged accumulator.
    6.  

    If the pump motor is allowed to run continuously for approximately 20 minutes, a thermal safety switch inside the motor may shut the motor off t o prevent it from overheating. If that happens, a 2-10 minute cool down period is typically required before normal operation can resume.

    HYDRAULIC PUMP PRIMING



    1. Remove the dust cap from the right side rear caliper bleeder fitting. Attach a rubber drain tube to the fitting making sure the end of the tube fits snugly around the fitting.
    2.  
    3. Turn the ignition switch to the RUN position. This will turn on the electric pump.
    4.  
    5. Hold the brake pedal in the applied position. Open the right side rear caliper bleeder fitting for 10 seconds at a time until an air-free stream of brake fluid is observed.
    6.  
    7. Repeat the procedure at the left side rear caliper.
    8.  

    CHECKING FLUID LEVEL AND REFILLING



    1. With the ignition switch ON , pump the brake pedal until the hydraulic pump motor starts.
    2.  
    3. Wait until the pump shuts off and check the brake fluid level in the reservoir. If the level is below the MAX fill line, add fluid until the line is reached.
    4.  


    WARNING
    Do not overfill! The level may be over the MAX line depending upon the accumulator charge. Perform the above procedure before adding or removing brake fluid.

     
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