I have noticed that when I make a turn at low speed onto uneven ground (as turning into a driveway for example) occasionally there is a loud pop and clunk and I feel the brake pedal move against my foot if I am applying brakes at that time. I think that this is a known problem with Impalas and mine has been doing this only once in a while. Is this related to the intermediate steering shaft or some front suspension component? My warranty is running out in a few thousand miles and I would like to fix this problem, whatever it is. It is difficult to duplicate though, as it does not happen all the time.