SO... Had them take off the front left wheel where the sound was coming from, I looked at it with them, couldn't find anything stuck or anything like that. Looked at the other 3 brakes, couldn't see or hear anything rattling. Just got home, (don't know why I didn't think to check this at the dealership) checked the outside of the brake pad and saw a very small groove where the pebble must have been stuck. It's not a deep groove at all, can barely feel it with my finger, but definitely something il keep an eye on. It's maybe a millimeter wide at the most going all the way around the pad, and like I said can barely feel it with my finger so I'm not too worried. In any event I feel much better now.
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2012 GM 6MT sports package | FI non res cf exhaust | K&N Drop Ins | Viper 3303 security system w/ tilt sensor | GTR start button | 35% rear 45% side window tint | Michelin PSS
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