2002 ford f150 supercrew - driving along brakes lock down after grabing

Suspect stuck caliper piston - OR - rubber brake hose going to the caliper has collapsed inside.

This sounds like a stuck caliper piston, though the ABS light could indicate trouble with the wheel hub assembly as well. If the vehicle jerked left with you not on the brakes, that makes me suspect the wheel hub even more. This could also be a failure of the ABS Control Motor, though that type of failure is very rare. I would recommend letting someone check this out and properly diagnose the issue. If we can help you with this, please give us a call at 864-877-5655. Thanks!