What is the difference between power brake pedal and manual pedal?

So why is the pedal so low after the booster was added? The booster came off a 66 Valiant and was just rebuilt. I have hard pedal and good brakes but I have lost about 2 inched and sure does not feel right on the foot. As far as brake rods go the manual master has the rod attached and the booster has the flat strap as a brake rod. Any good ideas???