Break booster squeal
 

When i apply my breaks, there's a certain "sweet spot" where all you hear is this really annoying squeal that does not stop unless you take some pressure off the breaks or apply more pressure. I'm not sure what it is but it sounds like it's coming from inside the Break booster or something. Anyone else have this problem or know how to fix this? any help is appreciated! (:

Do u hold the pedal in one position while engine is running to get the noise? If so the Booster is leaking. All u can do is replace it.

Yes:(
What will happen if I don't replace it? Any harm will be done? And how does that happen to begin with? Anything that I can spray on for it to stop leaking?

You're gunna have to bite the bullet and replace it eventually. Anything you can do will be a temporary fix. They are pretty expensive brand new so I'd start checking out junkyards around you for one that's in good shape.

what does the break booster leaking effect?!

Before you replace the booster. Have someone push on the brake pedal and see if you can isolate the sound I have had (on another vehicle) the air check valve go bad and it caused a strange noise. If it is leaking air the brake pedal will get rock hard you will have to press on the pedal with everything you have to stop.

Naw I can stop just fine. And me and my friend tried to isolate it today and we couldn't pinpoint it. Its coming directly from inside the break booster, it seems...