I'm not sure if you have exactly the same sound/issue as Clones95 but listening to his sound byte several times, leads me to believe that although his sound is in sync with suspension/road/tire movement, it does not appear to be suspension related but something semi-metallic touching another piece of resonating metal, its more like ping, ping sound than a squeak. I'm sorry I can't think of another reason without physical examination. Try gently leaning on the brakes to check if the sound changes, does it stop or change while turning left or right, does the sound persist if coasting or in netural (for a few seconds); you'll have to work on a process of elimination since it appears your dealer is a waste of time.