1997 - 2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Hissing when brake is released

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Old

Oct 1, 2012 | 10:05 PM

#1

03expymg

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Hissing when brake is released

When I release my brake pedal from a full stop I hear a hissing sound under the dash. It sounds like air is leaking from somewhere. The weird thing is that if I tap the brake it goes away!! It only makes that noise when the brake is released from a full stop and then to stop the noise I have to tap it. What the heck is this?? Anyone have this problem before?? I have an 03 expedition 5.4 xlt

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Old

Oct 2, 2012 | 09:08 AM

#2

alloro

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From: 0,0,1

Club FTE Gold Member

Disconnect and plug the large vacuum hose going to the brake booster. If the hissing went away you'll need to replace the booster.

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Old

Oct 2, 2012 | 09:38 AM

#3

critterf1

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From: Newport, N.C.

Leaking booster

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Old

Oct 2, 2012 | 12:13 PM

#4

03expymg

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Thanks for the replies. The only problem is that it's not doing it today. Is that something that goes and comes when it's going bad??

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