Replaced the calipers, hoses, front lines, turned the rotors, master brake cylinder and the booster. My 69 C-10 goes to a "rolling " stop. With the pressure on the pedal it will not lock up or stop on a dime. The vacuum is 15 pounds. I am stumped on what to do next. It is no better than before I replaced everything due to age. Any suggestions what to do next? Oh and replaced the synthetic fluid and bleed the lines.