This is interesting 2015 428 gran touring,,,,the right rear upper support arm bolt broken,,,,just the head of the bolt broke,,,,the customer said he hit a pot hole,,,,,the right rear rim is slightly bent,,,,but not to bad. Here the big problem the customer kept driving,,,,thing nothing happened to his car,,,,so the upper support arm was loose now and started to move around and came off and hit the rear axle boot,,,causing grease to spray all over the place,,,,and it started to grind against the  axle,,,,causing metal shaving every where as you can tell.,,,,this was one every expensive pot hole.