I have a similar issue with mine right now. I hear a grinding noise whenever I am going slow and turning and braking. It sounds like a brake pad eating up a rotor. I pulled all my wheels and looked at everything and could not find any damage to rotors and there is no noise when spinning the wheels while its up on jack stands.
Interesting to see if and where this thread goes.
2012 Mustang GT, Brembo Pkg, Yellow Blaze Metallic