I am having the same problem with the squealing brakes while in reverse. My sport has been back to the dealership 4 times since last month at which time I had all new brake pads and rotors done. I'm so frustrated with this because this squeal/squeak is very annoying. We pay far too much to have this work done at the dealership to have these issues.
Has your issue been resolved?
They still squeal after 2500 miles on them. I will wait for another 1000 miles before taking in. I would rather have the dealership people not touch the car if they don't have to!