Adrenolin

Whats the difference in pedal pressure between power and manual 4-wheel disks? I've had to remove the booster (today) and go to manual brakes for the time being. Due to some issues the booster has to go. If we need power assist I'm looking at one of these Hydroboost setups possibly. Anyone use one of these?

I know 4-wheel disks require about 900psi at the wheel. Not sure how this relates to pedal pressure. The hydroboost above puts out 1300psi.