Shudder w/ brakes -F-100

I just finished replacing drums, rotors, pads/shoes, and STILL get shudder w/ pressure on brakes - 1980/F-100. it doesn’t feel like it is shuddering the pedal. I had the front end all new about 2 yrs ago (tie rods, etc). I have helper springs on the rear leaf’s. Is it possible that the helper springs are causing this whole body shudder on depressing the brakes?? It’s not a daily driver, so this is annoying more than anything.