BRAKE QUESTION - HELP - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 05-07-2010, 06:26 AM Thread Starter
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BRAKE QUESTION - HELP

So one of my rear calipers on a 99 F450 2wd 7.4l froze . I bought a loaded set and replaced both sides . Bled the brakes and everything worked fine . A day later I go to use the truck and now the brakes are holding a super tight grip on the front , both sides . I shut the truck off and turn it back on , let it idle for a minute and the truck is fine I start driving up the driway and I touch the brakes again , bam the fronts are locked solid again . Shut the truck off and this senario happens again over and over . I'm totaly confused , is there some type of reset or did I bleed the brakes the wrong way ? Its got me totaly baffeld .
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post #2 of 5 Old 05-08-2010, 11:11 AM Thread Starter
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Help !
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post #3 of 5 Old 05-10-2010, 05:20 AM
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Air in the lines maybe? Bleed the fronts as well as the rears. Make sure you're using DOT3 fluid.
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post #4 of 5 Old 05-10-2010, 05:36 AM
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hhmmm, air in the lines shouldn't cause the front to lock up.
I would first think maybe the rubber flex lines in the front or one of them has rotted inside out and not releasing fluid pressure?? But i dont see how shutting it off would change this? interesting, good luck.

2008 6.4 f250 lariat 4wd
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post #5 of 5 Old 07-19-2010, 03:45 PM
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Drain your power steering system and temporarily start the truck and see if the condition still exists. If it goes away, you need a new hydraulic booster assembly.

Steve in Central CA

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