Sounds to me like you have something's stuck causing way too much heat and boiling the brake fluid. Front brake hoses don't last forever and they are double layer. What I mean is, I've had hoses go bad, they'll let fluid out to the brakes and then collapse internelly, not let the fluid return.
I'd jack up the car, you should be able to spin the front wheels very easily, if not, find out why. Brakes get hot, thats their job but, turning black and blue sounds scary to me!