Question about 1991 Ford F150
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
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Posted on Jan 02, 2017
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