I had a similar problem on my Subaru Outback a while ago. Whenever I hit a bump or made a sharp turn there was a sound that was not unlike the sound that is made when the brakes need replacement, just a little more “rattly”. I found out that the thin sheet metal shields that keep dirt/etc away from the backside of the rotors/bearings were slightly deformed when I replaced the control arms a while back. They were bent so slightly that only occasionally, under the right conditions, they would rub/tap the rotor for just an instant; but it drove me crazy. I finally figured out what the problem was, bent the shield back slightly, and now, no more noise. Hope this helps.