2004 Ford Expedition hissing sound

Tiny
CATHLEEN MEILE
  • MEMBER
  • 2004 FORD EXPEDITION
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 45,000 MILES
Our ford started making a loud hissing noise, under driver side dash, when brake pedal is pressed down hissing disappears but idle slows down and engine even has died twice please help so we know what we are talking about to repair shop
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Sunday, October 19th, 2008 AT 1:53 PM

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Tiny
BLACKOP555
  • EXPERT
The brake pedal easy to push down like normal? Stiffer then normal? How long does the brake booster hold air after shutting of the vehicle.

Disconnect and plug the vaccum line from the brake booster and push the brakes down hard, does that make the noise or make the idle change?
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Sunday, October 19th, 2008 AT 2:03 PM

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