Brake Foundation Components problems of the 1999 Hyundai Accent

The $ amt is currently unknown, I dont have my car with me milage is over 16000, I tried to conntact Hyundai via web couldn't will try tommarow. I just crested a short hill on a left hand turn. I saw a Mini-van at the bottom stopped. Mabey 3-4 car distances ahead I stared to brake I instancely noted I was not slow enough, I incresed brake press and filaly floored the bake, I went over a car and a half with the brake floored, when I was right on top of the Mini-van I relized the brakes were not working and that I was going to crash, I rearended the Mini-van, I left no skids and made no screech . When I floored the brake pedal I was expecting a quick but not rearending stop. Insted it was more like I put it in neutral and glided in. I have never had brake problems, and the brakes worked afterward though the care was only moved short slow distances.