Hey there! Had my A3 in to the dealer a while back but they could not find an issue, which is there answer to 99% of the time for anything. Basically whenever I am going over a speed bump (most of the time) I get a metallic rattling sound from the left side, front underside direction of the car, which can only he heard from the outside or with the hood / windows open. This also happens sometimes when I touch the breaks and slow speeds. Kind sounds like two metal objects touching / chattering on each other. Have jacked the car up and cannot find anything obvious. The only item I could get to vibrate was the break shield (black metal disc) but it makes a very different and indeed a pitched bell like sound. Was wondering if anyone had experienced anything similar / could possibly shed any light? Thanks in advance!