Thanks everyone! By now, I'm getting really good at the "Ford two-step." Two steps forward, one back. Drove the truck to the gas station around the block, noticed a bit of a burning smell when I got home. It's about a 5 minute drive. Couple of hours later I drove it 10 minutes away to a self-serve car wash. Got it as clean and shiny as it was going to get, and by the time I got home, the passenger front disc brake was smoking. Halfway home I could smell the burning brake smell. I cooled it down with a fan but didn't have time to take it off. There's plenty of fluid and the other brakes work just fine. I believe it's probably a frozen caliper or maybe the rotor is warped. I'll be taking the wheel off sometime this week. I'm glad the truck is up and running, now I just want it to be driveable!