I just noticed a hissing sound coming from my brake pedal when I press it down. It doesn't do it unless I press on it. I turned my car off to see what it would do and where as I usually can press it about 2-3X before it becomes hard, I only had to press it down just a bit 1X and it hissed and the pedal became hard.

Vacuum leak or brake booster?

Thanks for any replies.

 

thats normal

 

It's never does this sound before or acted like this. I mean yes, it makes a sound when depressing the pedal, but never when just holding it a certain position. Like when you have to press the pedal 2-3X when the car is off to get the pedal rock hard. I only have to press it an inch and it "leaks" all the vacuum out and becomes hard in seconds.

 

do the brakes work?

it shouldnt all bleed out in one press, maybe you did blow something in the booster