For the past several weeks I have noticed a sound that appears to be the brake pads rattling within the caliper housing on the front wheels under certain specific conditions. It is only noticable when I am turning a corner slowly without my foot on the brake, window open. When I hit a small bump or crease in the pavement, I will notice the rattle sound. If foot is on the brake and they are gently applied; no rattle. Brakes work perfectly at all times. Bad return springs? Anti-rattle springs?? Anyone??? New Sept. 2010. 6600 miles. Prius II. Silver. Clean windows. Smelly running shoes in rear compartment. NOTE: At 5000 mile service there was no sound.