[robnolimit]

Oh yes, I was gettin to that. Hydro-boost units use the pressure from the power steering, (hydrolic pump) And have a great amplifier advantage. There are many factors here too, such as p/s pump output, hydroboost bore size, and the pressure loading of the acumulator. As a general rule, I would use a multiple of 3.5 to 1 for most hydro units. The downside is a loss in pedal feel, some of this can be gained back by lowering the pedal ratio.

Next up, the good, the bad, and the ugly of all these items.