Originally Posted By John_Kunkel
Originally Posted By CMcAllister
Consider 500psi of fluid pressure at one 4-piston caliper.

With 1.38 pistons, the force exerted on the pads is 2960lb. total.
With 1.75 pistons, the force exerted on the pads is 4800lb. total.



It would seem that way but it isn't; when computing the clamping force of multi-piston rigid calipers you only use half the caliper pistons. IOW, only one side applies force, the other side acts as a backup. I know this is counterintuitive but that's the way it is.


After re-reading the tech information I was using, I believe that is correct. I had just skimmed through it earlier. The numbers can be divided in half. But the percentage of difference between using the 1.38, instead of the typical larger bore units, is still valid.

If the results don't match the theory, change the theory.