When applying the breaks there is a loud squeak (LOUD) you can even see pedestrians flinching when I pull up to stops sometimes. I motioned it in my last service and Ford service centre said it was the wheel bearing - they replaced that under warranty, however when I collected the car and drove it home, the squeak was still there (although not as bad).

Perhaps it is the bearing on both wheels and they only replaced one of them. Either way, when I took it back to Ford and said the problem was still there, they said they would not cover it under warranty and they would charge me a diagnostic fee on top of it. So basically I have to drive around with a squeaky Mustang now (it is a real head-turner, lol).