My wife's '09 MKS had a groaning sound when stopping, too. Took it to our dealership, and there were 2 seperate TSB's for the front and rear, I don't know what the numbers are, but they put new pads and rotors on the front, and for the rear, new pads and cut the rotors. This was done at NO COST to us, and the car had almost 46,000 miles on it at that time. No more groaning, I'm now a happy camper. Possibly there are tsb's out for the Edge, too.