The breaking system on my audi rs5 is causing the vehicle to shudder quite violently. there has been some shuddering since i bought the car but now with only 20k miles it is getting worse. i asked the dealership to check it out, but they could find nothing wrong. i have since learned that the shuddering experience is not uncommon in the rs5. apart from the discomfort i am concerned that there could be a safety issue.