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The original standard m/c for the 944 was a 19/19 unit that was later changed to 23/19 and that is the one that most people refer to as the 944 m/c. Fluid volume is not really the issue with a fully working system with good lines and fresh fluid (well bled). The basics of hydraulic advantage is that the pedal effort is multiplied by the area of caliper pistons (2No.) / area of mc piston. The stand off of the pad from the disc is very small so as minimise pedal travel. The main effects on pedal travel are hose bulge and water/air in the system that then compresses.
On a bug with a larger caliper piston area at the front than on the rear the stepped m/c can be of some advantage as the desireable brake bias is unity i.e. the braking effort front and rear should be about the same. The larger m/c piston is around 45% larger in area than the smaller piston and therefore gives 2/3rds the fluid pressure than the rear line.
evilC
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