Question about 1991 Ford F150

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POOR BRAKE PEDAL WHEN RUNNING ON 99 F 150 CHANGED MASTER CLY HAS GOOD PETAL WHEN NOT RUNNING

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  • bishop_gueri Nov 17, 2009

    WHAT ARE THE ODDS THAT THE BOOSTER IS BAD THE PEDAL IS RIGHT THER WHEN THE TRUCK IS NOT RUNNING IT HAS 150000 MILES ON IT AND IS ORIGINAL BOOSTER

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  • Master
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Be sure to bleed the brakes at all 4 wheels. You may have a bit of air in the lines after changing the master. Remember that air compresses and hydraulica oil doesn't. So if there's air in the lines, your pedal will be spongy. The powerbrake booster will make this even more noticeable when the truck is running.
Bleed the brakes. Start at the right rear, then left rear then right front and finish at the left front. BE SURE TO CHECK AND ADD BRAKE FLUID BEFORE YOU START, AND AFTER EACH WHEEL IS BLED. The fluid level will drop quick and you need to make sure your reservoir always has sufficient fluid.
The secret to bleeding is have an assistand pump the brake pedal and then hold firm pressure on the pedal while you slightly open the bleed valve at the wheel cylinder. Make sure the assistant holds the pedal down until you get the valve closed. Then have him pump the pressure back up and repeat. Check fluid level and move onto next wheel cyl.
If all air is out of the lines, you may have a booster that's going out and needs to be replaced.

Posted on Nov 17, 2009

  • KEN LaPOINT
    KEN LaPOINT Nov 17, 2009

    Try this:
    With the motor running. Step and hold medium pressure on your brake pedal. Does the pedal drop and then hold at a certain point, or does it feel like it's continuing to drop despite your medium pressure?
    If it's still dropping, then it's got to be the booster, but if it's holding firm only lower than when the motor is off... check for air in the lines... hope that helps... K


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