Ok here's my really annoying problem:

When I am in reverse (89% of the time) and I cut the wheels completely in one direction or another, I hear a high pitched squeeling noise when the car moves (not when standing still)

This high pitched noise also happens very occasionally when I am turning.

Took it to my mechanic and he said they cannot find anything wrong.

any ideas?

i have the same problem. its just the tires squeeling

Dude no offense but I don't spin tires going in reverse.

This is not the tires, since it only started in the last week, and it's much more of a metallic sounding "squeel" than an actual squeel that you would think of when dealing with tires.

My brakes are down pretty low. Does anyone know if the brakes needing replacement could have anything to do with this?

im sure the brakes dont need replacing

you dont have to spin the tires to make a squeel. When you are at full right or left the tire might not be perfectly parallel therefore creating a squeel. anyways...

it could be the power streering pump

^^^ def the power steering pump...ever heard the old Fords? just thank god it doesn't sound like that! lol

Yes, probablly PS. Just don't turn the wheel to full lock.