Hissing when brake is released

[03expyMG]

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??

 

[03expyMG]

It's not doing it today. Very strange. If anyone can offer any input it would be great.

 

[FordandPolaris]

It could be something to do with the brake booster under the hood. Can you only hear it from the inside of the vehicle?

 

[Big White]

Definitely a brake booster.

 

[01yellerCobra]

Had that happen on my old Bronco. The diaphragm inside the booster has a hole in it.

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[03expyMG]

Gonna just replace the booster. I'm pretty sure that's what it is also. Thanks for the input. Will report back once it's done. How long can I ride with this thing like this? Can I wait a few days??

 

[toms89]

Snake under the dash??



Yeah... I would go with booster leaking issue.

 

[ELVATO]

Haha, yea. It's been months (years?) since mine's been like that. I play my music pretty loud so I didn't actually notice it until a few months ago.

All I can tell it does is require a longer pedal travel before actual braking? Unless I also have air in my lines, haha.