Not the best advice. The pedal geometry between a power brake car and a manual brake car are different. Very different. Doing this compromises your safety and the safety of others around you.
just a hard pedal... caused by bore size and leverage, if you can push the pedal the car will stop. If you have a bad leg or a weak leg then yea, probably not the best idea but if your healthy and without issue you can push it. At the end of the stroke the same pressure at the wheels is being applied.
I can lock up all 4 on the swinger with factory disc/drum and un-powered power brakes (wouldn't be that way if they will made a check valve with a 3/4" nipple for the 13/16 seal...)
