Brake Disc Caliper problems of the 2014 Ford Fusion

Brakes failed when operating the vehicle. I reverse and the brakes went completely soft. It was difficult to completely stop the vehicle, at lower speeds, but I managed to do so with no damage done to the exterior of the car. I drove my 2014 Ford Fusion awd a few feet to park the car making it easier for towing to the river town Ford's dealership. I saw smoke on the right side of the car coming from the wheel area. I turned off the vehicle to assure no further damage to the brakes and rotors. I press the brakes, while the car was off, and notice brake pressure was back. I confirm it was still unsafe by restarting the car and then a low brake fluid indicator came on and all brake feel went limp to a point that pushing the paddle all the way to the floor board did not engage the brakes, e-brakes I suppose was being used at this point. The next day I get a call from the dealer telling me that the car needed a new brake hose and copper washer on the front right side of the car; the initial cost was 203, then with each phone call, because I wanted part numbers to check cost of parts, the price went to 340 dollars for a brake hose and a copper wash replacement on right caliper, by the way the extended warranty didn't cover this cost so no accommodations for a rental and all cost fell on me the customer because of vague extended warranty information. They also told me that the brake hose was not tampered with it just disconnected/popped out from too much pressure. This happens at 37800 plus miles after the warranty dies out and close to the mandatory 40k dealership inspection service. In the end I paid 289. 66 after pulling teeth with the clerks, who answered the phones, and also calling the manufacture for information about Fordpart. Com website and coverage. Suggest a further testing of this brake failure. Ford should have covered this cost not me for their faulty parts.