I have the exact same problem, changed the disks, pads and the master cylinder but the issue is still there. Also gone down the path of wheel alignment and balance still no luck. I know 100% my brakes are grabbing cause I'm changing pads every 4 months. One thing I have noticed is that it is a little better since I changed the master cylinder, I'm thinking of changing the brake lines do you think that is the right path or should I give Ford a call.