| The larger the MC bore the lower the fluid pressure (at the slave/caliper side) (but higher fluid flow/displacement) (assuming an identical pressure on the control pedal). The smaller the MC the higher the fluid pressure and (at the slave/caliper side) (but lower fluid flow/displacement). For all but the most badly designed systems, fluid flow/displacement is irrelevant as brake calipers do not need extra flow/displacement to do their jobs (extend between the resting position in the caliper to obtaining caliper/pad contact with the rotors. Pressure (smaller MC) not fluid displacement rules for brake raw stopping power as the pressure is transmitted MC>brake lines>caliper>pads>rotor (squeeze) essentially without pressure loss (via essentially non-compressible fluid). On the other hand a larger MC for the clutch (which displaces more fluid) would provide more movement of the clutch slave cylinder/release arm and may provide better clutch feel and control if the release arm is adjusted to use the extra slave cylinder travel effectively. The force (pressure) on the clutch slave cylinder/release arm may not be as important as the control offered by reduced pressure/higher fluid flow (assuming your leg is strong enough to overcome the clutch spring pack).
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