Is a 2013 Ford Fusion Rear Brake Failure/Covered under Warranty?

I'm an Owner of a 2013 Ford Fusion with 18,712 miles on it. 2 weeks ago I (from the inside of my car) noticed a noise (grinding) from the right rear of the car but only while braking. Additionally while applying the brakes, it felt as if the cars brakes were engaging as if I was pumping them (I was applying steadily-increasing pressure). I immediately took the car to a nearby Good Year and paid $145.65 to have the car inspected, and they found that my calipers have seized, warped and destroyed my rotors and the brake pads were worn to almost nothing. Good Year assessed the cost to be $1,297.26 for the replacement of the brake pads, both calipers and both rotors. They advised the car not be driven.

My question is: Is this covered under warranty? My car has 18,712 miles and I've had it for less than 3 years. If not, than why?

Additional Information: Had to pay $300 for (SEP 28- OCT 6) a rental till the car was able to be seen. Received the car back today (OCT 13) with only the recalls fixed and the brakes still the way they are (CONFIRMED by ford AFTER picking the car up). Brings me back to my question, Are the Rear Brakes (Rotors, Calipers and Pads) covered under warranty? I believe this to be a Ford Fault and shouldn't have to pay to fix such a major issue at only 18,000 miles.

Not intended to sway people from buying from Ford. Just giving my scenario to receive the best answer possible. Thanks for the Help!

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