Okay, after reading thru quite a few threads, I am coming back to this one, as it is most similar to my problem. About 5 days ago, this started. I didn't do any brake work. Last work was entirely new front end(lines, calipers, pads) 3 years ago. When I release the pedal, I think I hear a minor clunking noise from the rear. So far I see no leaks, but maybe it's a bad drum cylinder? If it is bad, will it be obvious when I pull the drum cover off? (visible leakage?). Thanks!
Blue 1993 Wrangler YJ, 6cyl, 4.0L 5spd, 140K miles.