Master cylinder

For comparison sake
A 2.375 bore has 4.43 inches sq.
500 psi line pressure is easily achievable with even a small 15/16 M/C. With a tiny bit more legpower, the 33/32 M/C can make 600psi. Doing the math with 600psi line pressure; 2.375 x 600=1425 pounds of brakeforce.

The KH 4-piston set-ups have 1.625 pistons @ 2.074 each x 4 =8.295 total. These stop very well, with minimum foot pressure. At just 500psi x 8.3 sq inches = an awful lot of brakeforce. I get 4150, which is nearly 3 times as much....
I don't think I would want too much less on my 3650 pound tank(me in it)