Hmmm.... in my house, I have 65psi at the meter. If I have some lines that are 1/2" dia and some that are 3/8" dia, I should measure a higher pressure on the smaller line according to the posts here..... sorry, it didnt work. Maybe it's because a brake system follows static fluid rules and the garden hose theory follows dynamic fluid flow principles? A brake system is essentially a static flow system, there is no significant fluid flow after the initial piston expansion....when the braking is being done.

Such is why a pressure calculator (such as the one on the Mark Williams site) does not ask for line size, length, material, color, or political alignment.....nor does it ask for the diameter of the wheel cylinder.....it is based upon the master cylinder bore and the applied pedal force to the master cylinder.... lbs force and square inches!

The brake line is only a medium in which to transfer the fluid. If a wheel cylinder requires 1/2 cubic inches of fluid to move a certain distance, the volume and pressure has no bearing on how big or little the transport hose is.....