73 Duster front disc brakes dragging when hot
Okay... the brake lines look really good. They were replaced in 2005 and the car sat for 9.5 years.
Sat for nearly ten years. My guess is that moisture has built up and corroded the piston in the caliper, not allowing it to return.
AND, just because the hoses look good, does not mean they haven't collapsed on the inside, a common issue, something you ain't gonna see by looking at them.
Here is what I would try, make sure your bleeder screws are free, and you can loosen them. Take it out and warm them up as you did, jack it up, release the bleeder screw and see if the resistance goes away.
IF it does, the rubber lines are most likely the culprit.
If it does not, my money is still on the caliper seizing in the bore. I would completely flush the old fluid out, rebuild or replace both calipers add new fluid and bleed the system (I usually opt for replacement, they're fairly inexpensive and really important).
Conventional brake fluid attracts moisture, and really is a maintenance item, it should be flushed and refilled every couple of years. How many of us do it? Probably not a lot, but it should be done.
