When changing direction with the steering wheel I feel a distinct knocking feeling come from the wheel. I can also feel it in the brake pedal when I am at a stop and turn lock to lock and reverse. When I'm driving over rough patches of pavement I can feel it then too. Any thoughts to what this might be? I did a quick visual check of the suspension but I'm not sure what to look for. The car has 63K miles on it. Power steering fluid isn't low.