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Old 03-01-2007, 03:32 PM
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Brakes loosing pedal

My Ford truck starts out with good brakes and after a drive of 1 hour the pedal goes half to the floor. Have replaced just about everything. Any ideas? Thanks

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Old 03-01-2007, 05:00 PM
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Need an idea of year and model.
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Old 03-02-2007, 07:48 AM
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84 Ford F150 4x4
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Old 03-02-2007, 01:20 PM
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My guess is either air left in the lines, a leak somewheres in the system or a MC going bad.
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Old 03-02-2007, 01:53 PM
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brake fade

My best guess is m/cyl.does brake pedel fade when you apply hard ,sitting still? also could be water in fluid,but not likely.I hope you no loosing fluid. hope helps
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Old 03-02-2007, 02:20 PM
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How is the rear brake adjustment? Could be M/cylinder bypassing. Could be leaking rear wheel cylinder. Are you having to add any fluid? let us know?? Brian
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Old 03-02-2007, 02:45 PM
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Thanks for the input. I'll double check each fitting
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Old 03-03-2007, 01:09 AM
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Do the brake lines run close to the exhaust at any point? Heat from the exhaust could be boiling your brake fluid. If so reroute the brake line and bleed the brakes with some DOT4 stuff.
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Old 03-09-2007, 07:00 AM
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Thanks. I'll check
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