After owning several Ford trucks with rear drum brakes, I am convinced that Ford cannot make a self adjusting drum brake system that is worth a carp.
On all my Fords, no matter how well the rear drum brakes were manually adjusted and working great, it only lasted for a while and they would be right back to being loose and the front brakes doing all the work. And I did alot of backing and braking with my trucks, which is how the adjusters are supposed to self-adjust.
In my experience, Ford rear drums require manual adjusting about 3 or 4 times on a heavily loaded truck (or motorhome) between a typical oil change interval, or you won't have any rear brakes.
I had never needed so much adjusting with my old Chevys or Dodges with rear drums.
