What would cause front brakes to lock up while driving??

Check brake pedal free play and replace both front flexi brake hoses, as one may be collapsed and this can often work as a one way valve, drive and when brakes start to lock, crack bleeder and see if it frees up.

looked like it was the ABS pump.. took it out and the wires was burnt and exposed, and replaced with used ABS pump from a junk yard... The engine light went off and now the ABS and TCS lights stay on, and it still locks up the brakes. PS ((already checked the brake lines and replaced everything else between the cylinder to the brake pads)) ... im guessing its the computer it self??