Hydroboost braking systems

I want to put out there my only complaint with them I agree they work much better than conventional vacuum booster systems as long as the motor is RUNNING!!! If the engine dies your brake pressure quickly goes down hill each time you have to let off after you have let off the pedal and applied it three times the reserve tank is depleted and you are down to full manual brakes. Different articles say different things about how much you have on the first second and third times pressing on the brake but most aftermarket companies claim 60-75% the first time 30-40% the second time and 10-20% the third time. Now granted vacuum operated brakes do the same thing usually even worse actually but they are cheaper than the hydroboost conversion also, most people don't mention how quickly you have manual brakes on a hydroboost system as soon as the engine dies.Good Luck Justin