Mine has the same rattle, however if I am applying any rear brake when I go over the same bumps, there is no rattle. I have taken mine to the dealer purchased from and was told nothing the matter. In fact when I complained about the brake squealling, was told to use the front brake instead?!?! I took it last Friday to my local dealer, sevice tech looked at it, and said "Oh My, that is loose". Took down my info and called the district service rep. They called me back and said Suzuki would not do anything about it, out of factory warranty, if it had still been in warranty they would have replaced it? Said it was not a safety issue, just a nuisance noise? I have one more dealer within close distance, going to try them in a couple of weeks to see if they will do anything? Assume I will have to spend my money and take care of it?