To add to the info given. The size of the line can be 3/16 or 1/4, whatever you want. Same performance. No worry about "distance" in the case. Our old trucks use 3/16 all around. The master cylinder creates the pressure, It's a closed system. A larger MC piston will have a shorter pedal travel.
If you want to go deep which you don't need to.... There is no conflicting info about this.......but here we go.....

A so called "proper" pedal travel is normally calculated for disc/disc. So you will not get an accurate "proper" pedal travel...AND you are thinking of modifying the MC rod. So your "desired" pedal travel to fit your physiology would be calculated with voodoo math and is on you. I would think more of modifying the arm to move pedal pad, not messing with MC rod stroke. That will get you in all kinds of trouble. There is a specific way to set up the MC push rod and must be followed and left alone. I think you could possibly adjust the pedal stop to give foot room, then adjust MC rod to spec. as long as there is enough stroke for MC.

But anyway..... you are shooting for 5:1 to 7:1 pedal ratio for mechanical and 4:1 to 5:1 power assisted.
Pedal ratio is the distance from center of pedal up to pivot point of pedal arm, divided by the distance from pivot point of pedal arm to where MC rod connects to pedal arm.

If you want to know what pedal ratio you need....keeping in mind you only have disc in front....... you calculate the area of the caliper piston diameter and the area of the bore diameter.....and divide the caliper area by the MC bore area.

I.E. 1" dia bore and 2.5" dia piston= 4.91... desired ratio = 4.9:1 You can play with pedal geometry and bore size and etc to reach the foot room and desired numbers.

You forced me or I lost my kiss compass, to make a mountain out of a mole hill and to contribute to over think.

Last edited by bartamos; 06/19/2025 5:30 AM. Reason: clarification
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