I've got a base model 2015 200 with the 12" brake rotors. I put new pads and rotors on about 2 weeks ago and ever since then it sounds like the calipers are bouncing around on bumpy roads. Rechecked all bolts, still tight. Calipers seem to have some play that I can't figure out. Rattling noise goes away if I press brakes. All greased, new pad retainer hardware and it's tight too, checked all over suspension components and they're tight.