LONGBOX55,
I was taught that there is just so much pressure that can be applied by an automotive brake system through a 1/4" line. The Vehicle will use whatever pressure is applied and doesn't care where it comes from, manual master or power master. Since the booster doesn't enter into the fluid side of the brakes, all it can do is add "pedal Pressure." The booster does make the pedal pressure easier to apply, so in that sense it can increase braking, but only in that sense. It does NOT increase line pressure over what someone with a strong, determined leg can do!
The booster just changes the feel of the pedal, not the efficiency of the system.
best wishes,
Les
