looks like my right foot injury is permanent, annoying, but ill add it to the list of other body damage , what i need is to increase the power assist on the brakes on one of my trucks, i have only old trucks, thats how i like it, but my 2 chevys, a 80 and a 83, both 1 ton duallys both flatbeds and heavy have hydroboost systems, stomp on the brakes and they stop, fast, now my 71 ford 1 ton is the heaviest it weighs close to 11000 lbs just by itself, its vacuum assist power brakes on a drum system, stopping is more a general idea, than a activity, my injury doesnt allow me to put a whole lot of pressure, [read both feet] on the brake peddle to stop this thing fast, i have a steady 15 lbs of vacuum available to the booster, and both it and the master cylinder are new, any ideas how to increase the assist?