Check Brake System and IP Brake Light ONHave a unusual problem on my 2014 F150 FX4 with ABS, Traction Control and the 3.5L ecoBoost, on my way home the truck was not slowing down when the brakes were applied and the pedal felt really hard to push but the harder I pressed the more a grinding noise made and then started to slow down. If at a stop I would have as much pressure on the pedal trying to keep the truck from moving and yet it was like the pressure in the line would weaken and the truck would move. Feels like possibly the Master Cylinder failed or something. I have plenty of Pad left and all the lines are connected and the brake fluid reservoir is full.

Any Ideas as to what the problem could be or how to correct it to be able to drive it to the dealer?