Did you replace that hose? Didn't bleed it enough, so you have air in the system, maybe? Is the pedal spongy, or does it just go all the way to the floor without any resistance at all? And how can a brake hose make the brake lock up? More questions than answers, but as already mentioned, you need to provide more information about what you have done to it. If I had to guess just by the info you have provided, you need to bleed the brakes. I'd do at least both front brakes, and if that makes it better, go ahead and bleed the rear ones too, air can travel in mysterious ways in a brake system.
1969 Malibu in progress