I have a 2003 mustang. I just got two new front tires put on 4 days ago. The day after I started to hear a rattling when braking. It's worst when I'm going 30 or more mph then have to stop. If I'm driving less than that and can slow down to around 10 mph before really baking i don't hear it as much. With the a/c on and the windows rolled up I can't hear it at all. When I take my foot off the brake and start to accelerate the noise goes away. My brakes seem to be working fine and the pads and rotors were replaced about a year ago, maybe 7,500 miles on them.