[Myoldtruck]

I had similar problem when i got my truck two years ago, mine was related to emergency brake cables. I oiled the heck out of the cables from the cab back. I also replaced all rubber parts, cyclinders, hoses. Wire brush all parts in the drum and use anti seize on backing plate where the bumps are and on upper pin. clean and anti seize the lower adjuster so it spins very easy in your fingers, the grove end is suppose to spin on it also. Position your shoes properly, there is a front and rear shoe.

Once there right they will work good. I still have to manually adjust the shoes once a year, the self adjustment works when it wants to ive found.