TODAY is a Great Day to visit our Store and order the parts you need for your truck!
Stop looking at air bubbles outside of the system as air inside your system. Manually bleed the entire system, from the RR, LR, RF, LF and then gravity bleed it. Make sure the rear brakes are properly adjusted.
...There isn't an adjuster hole in the backing plate so this is as good as I think I can get them...