Releasing the bajno or just cracking the bleeder sounds like a good diagnostic. If that releases it, it is either hoses or master. If not, calipers are stuck.

I know on my/my daughters 98 Neon, the brake dragging hard on one side was caused by an internally collapsed hose which held pressure. New hoses fixed it. I did them all. Also, same car, a soft sinking pedal was caused by a bad master.

Agree once you figure it out, replacing all rubber hoses is a good idea even if that is not the immediate problem.