I have searched high and low to no avail. The car seems to have a weird rattle (almost like the sound of a rotor rattling around on studs) when I go over little bumps. Applying the brake seems to make no difference in terms of eliminating the sound and he car drives fine and straight. This all started after the right side wheel bearing and the PTU were replaced by Ford. I took the wheel off and noticed the tech didn't put the small bolt securing the rotor to the hub back in, so I did that. I took the caliper off and reset it (both side of the car have a lot of play in the caliper rocking it back and forth), looked at the ball joints and tie rod, all seem good and tight. I noticed the rear engine roll restrictor mount was in pretty bad shape so I replaced that today, no difference. I am not sure where to look next. Since the sound is produced easily, I figured rocking the car would produce it but it doesn't seem to do it. I also noticed that it seems to only do it when the car is going straight. Any ideas?