emergency/parking brake help

I think they ar all the same set-up, just different lengs for diff models/years. Front cable puld on the intermediate and that pulls the two back ones. Sounds like the front one is moving OK. I'd disconnect it from the intermediate and check that it is moving freely. The intermediat is just a steel cable. It does have a piece at front passenger side that is held by a j-bolt that needs to be able to slide on the cable. The back cables need to slide inside like the front. They are most likely the real problem and you will at least need to pull the drums to get enough play to even try getting them freed up. Not sure what $ they go for to decide if worth fighting with the old ones.