Can you elaborate? I did quick research and find no info that the MC itself is any different. What makes the system a diagonal or F/R split is the external plumbing. Link below gives some brake design info, including prop valve adjustment: www.sae.org/students/presentations/brakes_by_paul_s_gritt.pdf
I found some guys questioning if some BMW's have a special "stepped MC", i.e. different bore size for the 2 pistons: www.bimmerforums.com/forum/showthread.php?1776935-Master-cylinder-(-diameter-
But no reason to think that is true of the cloud car MC I used. It sure looks like the same bore size externally. Indeed, I have a spare MC rebuild kit for it, so I'll look at the piston again (don't recall but one diameter). Even if it were stepped, that would just affect the split to the R circuit and I have an adjustable prop valve so could tweak it perfect regardless.
