I had the same thing, and the dealer took the brakes apart, cleaned all the parts, and "lubed" the parts that are supposed to be lubed (a bit disconcerting that they need to "lube" brakes), and the squealing went away, and after 2 mos, still hasn't come back.....I am wondering if the lubed parts lost the lube in the carwash since the wheel cleaning method includes a lot of soap and high pressure sprayers directed into the wheels and brakes....On the upside, my wheels always end up clean, as do the calipers.....On the downside, the lube on the "lubed parts" comes off and causes the squealing.....Who knows, just a theory,,,,,,Good luck!