The hydraulic pipe diameter should make no difference, if it is assumed that the fluid is incompressible, and the pipe's volume is unaffected by internal pressure.
Looking at it very modularly, the fluid leaves the master cylinder, is displaced into the tube, which in turn displaces the slave cylinder's piston.
The only way I can see the larger bore pipe making a difference, is if the pipe, because of its greater diameter, expands sufficiently under pressure, that it "consumes" some of the fluid displaced by the master cylinder, thus reducing the movement of slave piston.
Craig, my point about the system, is that it is qausi static, and that flow speed can be ignored. It's not like fuel hose, for example, were there is a pressure drop resulting from the flow, hence it being advisable to measure, and regulate fuel line pressure as close to the point of use as possible.
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