I test drove a powerstroke the other day, 1995 auto just to see what the power difference was. In my opinion, not much but what got me by surprise was the brakes... Barely pushed the pedal down and it was slowing down quickly. They felt really responsive. What are the differences between the ones on the IDI and the PS?? I have to have my pedal half way to the floor for them to do much... Brakes were just done, adjusted the drums, etc. Vac pump time?? How do i replace it??