It really matters what is stuck. You don't want to spray wd40 on brake shoes. However, if it is something metal that is causing the issue, it should be fine.
I'm not sure if your vehicle has rear drum or rear disc brakes. The procedure for cable replacement is different. However, I will add the directions for both. If you look at the pics I attached below, they contain the directions and pictures related to the procedures. Note that there are different cables.
I hope this helps. Again, the pics below show the removal and replacement procedures and relevant pics which correlate with the directions. The first 4 pics are for the equalizer cable. Pics 5 through 13 are for drum brakes and the remaining are for disc brakes.
Take care and let me know if you have other questions or need help. Also, you listed the trailing arm above. If you need directions for that procedure, please start a new thread. We try to keep the posts specific to one topic. That way it helps others. I hope you understand.
Check out the diagrams (below). Please let us know what happens. Take care, Joe
Images (Click to enlarge)
Thursday, March 18th, 2021 AT 6:32 PM