Yeesh, talk about disc brake drag- I took a car of mine that I hadn't driven in 3 years on a long trip and discovered the right front caliper didn't want to release. I had to pull over 4x in 350 miles to jack up the front, remove the wheel, and pry the caliper open with the tire iron. Thanks to a tailwind and slow 'n' steady driving I still got 40.2 mpg, including some city driving where I'd made a few wrong turns.
Bought some tools and honed it out when I got there. Thought I'd be golden for the trip back but noooo. This time after prying the caliper open I went 250 miles to my destination without using the brakes at all via judicious use of ignition-off downshifting!
I've read about rubber lines collapsing internally but hadn't had that happen to me before. Looks like it's gonna get new rubber lines next...