So I hear this whistling low sound on the front right behind the wheel. I hear it even when the cars not on. At first i thought it was the tire losing air but it didnt go flat. it sounds like it though. It all happened today after the mechanic replaced the 2 front belts and I drove thru the alley to get home. What is this sound? Any one know?

 

so youre hearing the sound with the key off and the engine not running?

 

Both turned on and off.

http://youtu.be/lmlz6LklNYY
Check it out

 

Pretty sure that's your tire losing air. MAYBE a high pressure line venting from a small leak but less likely.

 

Tire + crappy wheel installation?

Did you use PSI gauge and check tires?

Maybe it's aliens

 

So everyone agrees that the tire might be bad. I have not checked tire pressure. Also is that why I hear the grinding sound of the brakes on that same side? They were installed last week but it sounds very bad the last 3 days. What could it be?

 

Check!!

 

could be the clips misaligned or the backing plate rubbing

 

It was the back plate causing the grinding sound! and it was the tire losing air, took it to the tire shop and they said it had a nail. Damm it but they fixed it and when they took out the wheel, I had space to see if there was anything rubbing on the rotor , and sure enough the back plate was touching it! I bend it back just a little since I didn't have tools. but yea problems solve!