My right front brake is making a "thumping" noise when I apply the brakes. With a little pressure is when you hear the thumping. Once you apply a harder pedal, the thumping goes away. It's only happening with the right front though. Any ideas? It's annoying as hell and I don't want to risk damaging the brakes or losing the brakes. The car also does pull to the right when I apply the brakes lightly, but stops pulling when I apply the brakes harder.