Brakes pulling.
It could be the rubber brake lines, yes. I had the same problem. The rubber brake lines swell rather than transmit the fluid pressure to the caliper. If the caliper was seized, you would have noticed that when you collapsed it to put the new pads in. (Did you have the rotors machined, or just pad slap it?) I replaced the hoses, calipers and did a complete front brake job, repacked and adjusted the bearings and everything. Same problem, dove to the right real bad when stopping. Put it on the alignment rack, had a 2 degree difference between the right and the left caster. Set it back to specs, problem solved. Most places won't charge you to just check the specs, only if they actually align it.