We have a 2010 Jetta with a sporadic problem. On occasion when I park, the heat radiating from the wheel is intense and there is black dust on the wheel cover. The other wheels definitely are not hot, and I don't notice a problem with braking. We've had the car since September 2009 so it can't still be cosmoline which is what the dealer suggested the last time we took it in with this problem. The caliper on one of the other wheels was replaced when we mentioned this problem. Has anyone else had a similar experience? Thanks!