CJ, how did you make the diagnosis with the car standing still ? There is a small amount of play between the pads and the caliper rails. There is usually an insert between the pads and caliper pistons that keeps things quiet. If your pads are rattling, then the inserts are missing or you have a set of pads that are a shade too small. Are you sure it's not something else...like a CV joint going bad, or a suspension part tha's loose or damaged. Keep looking, but first check for those inserts between the pads and caliper pistons.. BTW, the caliper itself should not be loose.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.