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Reload this Page Hiss noise from brake pedal

Ford Expedition True expeditions require additional transportation conveyances: horses, boats, cars, for example. With a towing capacity around 9,000 pounds, the Ford Expedition can tow any of these. Ford adds a new top end King Ranch model for 2008, as well as an available rear backup camera and power-retractable running boards. The Expedition is meant for utility, not posing.

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Old 10-05-2009, 08:42 AM   #1 (permalink)
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Default Hiss noise from brake pedal
I'm getting this hissing noise after I release the brake pedal. I can make it stop sometimes by gently pressing on the brake again. Sometimes not though.

Any ideas what this might be??

2004 Ford Expedition Eddie Bauer 95k miles.
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Old 10-05-2009, 09:05 AM   #2 (permalink)
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Sounds like your brake booster is bypassing vacuum
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Old 10-05-2009, 10:14 AM   #3 (permalink)
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that sounds about right to me. I was thinking this could happen in an older vehicle, one that has a vacuum dump solinoid for cruise control.
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