We recently moved from a gas coach to a Phaeton also. We had used a Brake Buddy for a couple years but switched to an Air Force system with the diesel. Air Force system is a much easier and quicker hookup than the Brake Buddy was. Cannot attest to whether or not it works better because, when braking, I'm not sure the 37K+ Phaeton even knows my 3500lb Ford Fusion is back there.