It's going to be hard to tell if a brake flex line is good or bad just by looking. It sounds like they need the adjustment checked(it's not that hard to adjust unless there is a star wheel froze up) My opinion would be that if the vehicle pulls hard to one side when the brake pedal is depressed, you have a bad flex line. GM had a lot of trouble with them in the 70's and 80's models. I would not spend a lot of time monkeying with the adjustment before I replace both the flex lines. Make sure the wheel cylinder and seals are not leaking before anything(fluid on the the backing plate).
