Front brake locks up

After sitting for a few years I am getting my truck listed above back on the road.
New fuel pumps, tires, complete clutch rebuild, gas tank, rear brake rebuild, front bearings replaced. I've taken it out on a few short test drives and all seemed well. Yesterday after driving 15 miles the passenger side wheel locked up and was very hot. The rotor looked okay as well as the pads. I did replace the wheel bearings. I do not see any caliper leakage. Should I replace calipers or look at the master cylinder Thanks so much.