Its not going to put you thru the windshield when you tap the brakes you have to drive acording to the load and road conditions, are the brake shoes properly adjusted,and is the hydro vac working, if the truck has seen little use and has not been driven much lately there is a good chance that the a wheel cylinder has stuck, this greatly reduces your stopping power, there is nothing wrong with a stock brake set up when done correctly, I went thru a 23 2 ton Chev with new parts and pieces and it will throw you against the steering wheel and it has a overhead moving van body on it.
