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Why not switch to hydroboost? My 91 dually had it and that thing stopped pretty well, even with a gooseneck on the back of it.
Also, ceramic pads tend to stop better than semi metalics, but be prepared to change rotors more often.
My $.02 so here goes... I have the 8600GVW brakes on my 1985 C20. I am impressed how good they stop with a load in the bed or not. I can lock up mine. I know there is a weight difference between the Suburban and a pickup but 1 ton brakes should be enough to properly stop your rig. I would look to your power booster as a possible issue.
Pedal pressure seems normal when stopping gently. However, there is a point where applying more pressure to the pedal doesn't seem to make the brakes grab any harder. Basically, it seems normal unless you have to do a panic stop. Was your Bronco like this?
Yes it was exactly like that. Almost like the power booster had a "catch" in it.. Hard to explain but after I took the booster out of the equation I could lock up all 4 tires on demand... it took 2 feet but I determined the booster was the culprit in my situation. IMO a brake system in proper working condition should be able to lock the tires up "stock or slightly bigger in size" or something isn't right... unless you have ABS or rear ABS or are way past the GVWR for the braking system on your truck. How old is the rear rubber brake hose. Those can do some funny things when they go bad as the springs will release the brakes but not allow the full pressure especially in a panic stop.
[I'm pretty sure all the brake hoses are original. I've experienced bad brake hoses before and they act similar to a leaky check valve. This is a little different than that though. Also, bad brake hoses tend to go out one at a time which will cause pulling during hard braking but this stops very straight. It's definitely like the "catch" you described. Anyways, I think we're on to something now.