[KTL]

I agree with Bill K the star wheel access hole in the rotor is worth looking at first.

That said, parking brake system on older cars always seems to have some kind of issue that needs a little more work than just clicking the star wheel. Can be too much throw on the handle inside the car, crunchy and/or stiff cable operation, dragging/squeaking (which usually results in overly worn & tapered brake shoes), poor release characteristics, the list goes on......

I think it'd be time well spent to get the rotor off and have a good look at the whole parking brake assembly. It's really not that complicated and probably is a simple fix. Just don't try to force the rotor off by yanking on it repeatedly. People often do that and what happens is they wind up bending the backing plate that mounts the entire parking brake assembly onto the trailing arm. If the rotor doesn't come free from the brake shoes (this is usually quite obvious because you can feel the shoes hanging up on the drum & the backing plate flexing as you're pulling on the rotor), you have to retract the shoes by loosening the star wheel thru the access hole on the rotor hub.