My brakes have locked up, the VSC and ABS light are both lit up

my brakes have locked up, the VSC and ABS light are both lit up, i reeased the front brakeson the left hand side using the bleeder screw, the front brakes released, and when i went to try to drive forward they had locked upi again. meanwhile, there is nothing there when i press the brake pedal. the rear brakes pads were replaced 2 days ago, and the front about a month ago.when i first noticed something differant, it was that the brake pedal travel was very short, and when i come to slow down for a stop the brake pedal seemed like a brick wall, and the brakes were not doing much at all, i let off the brake pedal and pressed it again, rock hard for a moment and then went to the floor, and from that point on, no pedal whatsoever. could this be a sensor for the VSC, or ABS? or could it be something differant?