i have an 08 4.8i and get pebbles stuck between the rotor and the pad a lot more often than i like. Some times, it came out after a few mins of driving, a couple of times, it was too big to just fall out so i had to remove the wheel and pull it out with pliers. I am willing to bank that you probably have a pebble or something stuck in there but it's shaped itself so it wedges only when you go in reverse but not forward. The last pebble i had did this but in forward motion. THAT was embarassing! screeching around town just to get home so i can dislodge it. You can heard me from 3/4 of a block away.
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