I have a 2000 Ford Taurus ses. I had all 4 brakes just replaced two weeks ago, rotors turned, new pads; etc. Now there is a terrible knocking sound that happens when I apply the brakes, and only when I apply the brakes. I took it back to the mechanic that did them and he said that I have a bent rim and a steel belt has broken in one of the tires. Ok, fine, but wouldn't that make a knocking noise all the time? The car drives just fine, until I apply the brakes, Then the banging/knocking noise starts and it doesn't stop until I come to a complete stop. What can it be?