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I used to have a Mitsubishi Evo that did this. I was out of town for a few days and left the car parked in the airport garage. When I got back I immediately heard a metal on metal sound as I drove out onto the street. I started to slow down so I could pull over and see what was wrong, when I hear a sound like "Ping!" and something bounced off the ground. I never found what it was and the car never had a problem. I think I picked up a small piece of metal or a stone that got stuck around the brakes or something.
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