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What can cause a hissing, air leaking, sound from under the dashboard?

Tiny
BRETTWOOD67
  • MEMBER
  • 2007 DODGE TRUCK
  • 116,000 MILES
Hissing or air leaking sound from under the dash on driver side, changes pitch sound when I turn the steering wheel or step on the break petal.
Thursday, September 8th, 2011 AT 10:33 PM

2 Replies

Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
It sounds like you either have a brake booster that is leaking or you might have some vacuum lines under the dash that have holes rubbed in them. The booster is connected to the brake pedal so anytime you press on the brakes you will notice a noise if it is bad.
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Thursday, September 8th, 2011 AT 10:39 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If your hearing it while stepping on the brake pedal sounds like you have a leaking brake booster. If you get a hand vacuum pump you can rent one at auto zone and see if it leaks.
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Thursday, September 8th, 2011 AT 10:40 PM

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