2005 Ford Escape Hissing noise under the dash

2005 FORD ESCAPE
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HEBUS
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Brakes problem
2005 Ford Escape 6 cyl Two Wheel Drive 59,000 miles

When driving begin to hear a hissing noise under the dash, seems to be above the brake pedals. When you step on the brake, the noise disappears, then comes back a bit later, but at higher speeds I can't hear it.

Just had mechanic look at it and said they vacuum tested the booster and is holding vacuum. But the noise remains - please advise.

Thank you
Aug 21, 2010 at 7:30 PM
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JACOBANDNICKOLAS
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A hissing noise is usually a vacuum leak. Start by checking to see if there are any vacuum hoses in the area of the noise. Also, check the power brake booster for a leak.

Let me know what you find.
Joe
Aug 24, 2010 at 9:45 PM