2003 Ford Expedition Hissing Sound on '03 Expedition

2003 FORD EXPEDITION
80,000 MILES • V8 • 2WD • AUTOMATIC
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TOMMYG61
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I can hear a hissing or air leak sound that goes away when the brake pedal is depressed but comes back when the brake pedal is release. What could this be?
Oct 17, 2009 at 7:12 AM
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