Unable to solve brake pulling problem E250 EB

[JWA]

I'm curious if after all these parts replacements were the caliper pins properly lubricated?

I will add all three of my E-Series without ABS triggered (totally dry asphalt paved road) tend to have the right side rear end swing out during hard braking, requiring a bit of counter steering. They simply won't stop in a straight line but in no danger from sliding out of control, just that momentary "panic" wondering WTH is going on?

My brakes are all in proper working order---I think this condition is just part of the normal 2 wheel drive suspension and braking system.