With the weather getting cold, we have noticed a one time clunk with our '09 sonata. Basically when braking and hitting lower speeds and coming to a stop, the car does a one time clunk when it's cold. I guess you don't hear anything, just feel it in the car. If I keep driving around, as long as the car is cold, it will do it one time braking at lower speeds to a stop. Once the car is warmed up, it does not do it anymore. I put new brake pads on the car a month ago, and bled all four brake calipers. When I jack up the car, there is no play in either front wheel. I checked all bushings, and nothing is cracked or falling apart. The car only has 48,000 miles on it...basically looks brand new all over (outside, inside, underneath). I'm at a loss. Any ideas or help would be appreciated! I did a forum search for 2009, thump, clunk, jerk, and couldn't find anything. Sorry if this has been covered, but I hope there is an answer out there!