Brake problems on 92 silverado

[Hydratech®]

Typically the rear drum brake self adjusters don't work all too well (requiring periodic manual touch up adjustments), though sometimes the brake self adjusters will become too aggressive, especially with drums that have been machined heavily. I'm thinking that the E brake could've also been applied and some point, and that they aren't releasing all the way afterwards per stiff / rusted cables...

On a harsher note, you may be losing an axle shaft bearing, which wreakes havoc on drum to shoe air gaps and contaminates the shoes with sticky goo.