Seems like many of the 88ish-93 Ram pickups have an issue with the rear brakes being almost non functioning. I have read that the rear ABS unit that is mounted to the left frame rail above the rear diff is to blame. After wearing out front brakes, while the rears shoes are nearly unworn, I decided to replace all the brake wheel cylinders etc with new, remove the ABS unit, and run a brake line directly to the rear brake hose, eliminating the cast iron ABS unit altogether. To my surprise, the rear brakes are still lame. They bleed fine, apply fine, but I cannot get the rear brakes to skid the tires, even on loose gravel. so I am suspecting the brake safety switch/brake divider block, mounted below the master cylinder may be to blame.
Anyone have the answer to this? I know many 92-93ish Dodge truck owners who have the same issue. Rear brakes just don't have any power