Air Leak Noise Untill I Push The Brakes?

[tommynos]

Does Anyone Know Why My Car Hisses Like A Vacuum Leak Under My Dash,then Goes Away When I Press The Brakes?thanks In Advance For Any Answers..

 

[Red Regal T]

Sorry I missed this one. Your cannister is leaking vacuum where the brake pedal plunger goes into it. The seal may be cocked slightly to the side allowing vacuum loss. You may be able to fix it by detaching the brake pedal and manipulate the plunger to help re-seal it. If not, remove the booster so you can move the seal. If you can't stop it from leaking, it needs to be replaced.

If you don't have vacuum brakes, probably has something to do with your cruise control vacuum.

 

[tommynos]

Sorry I missed this one. Your cannister is leaking vacuum where the brake pedal plunger goes into it. The seal may be cocked slightly to the side allowing vacuum loss. You may be able to fix it by detaching the brake pedal and manipulate the plunger to help re-seal it. If not, remove the booster so you can move the seal. If you can't stop it from leaking, it needs to be replaced.

If you don't have vacuum brakes, probably has something to do with your cruise control vacuum.

i have the factory brakes it came with, i looked under and see a rubber boot conected to the pedal rod and thats about it ?

 

[Red Regal T]

That's just a dust cover. Try to locate the source of the sound. So you're saying you have the original Powermaster brakes? Or has it been changed over to vacuum?

 

[tommynos]

That's just a dust cover. Try to locate the source of the sound. So you're saying you have the original Powermaster brakes? Or has it been changed over to vacuum?

its not the vacuum,its the original powermaster..today i cralled my big butt under to see and when it first starts it makes a noise like when your trying to let air out of a baloon and trying to make it whistle..as soon as you hit the brakes it goes away,then after a few minutes its not doing it so i push the brakes and on the 3rd pump it makes the same noise?i cant see where its coming from it almost sound like its coming from this white plastic thing that is right next to the brake trigger by the petal?but im not sure..maybe this is normal when started,but i remember it doing it once most of the day,but most of the time it goes away after some time?