Brakes, Calipers and Rotor "Problem" for 2001 Z24 Cavalier?

I would rule out the anti-lock problem unless the anti-lock brake light on the dash is on and I have still never heard an anti-lock brake system make any noises like that, are you sure they replaced the right wheel bearing?, the other side could have been bad all along and finally if you need new brake pads I would get them put on and 2 new rotors as those rotors are really cheap to buy at the parts store, like $18 each.