KH Discs vs 73+ Discs

ntsqd said

Smaller piston area means nothing by itself, adjust the mechanical leverage ratio and/or the m/c bore size to achieve the pedal feel desired.

Depending on how driven on a light car the .750 rotor may be perfectly appropriate, and is certainly less unsprung weight as well as a lower Moment of Inertia.

If you were talking thermodynamics you wouldn't be talking to me. I know very little about it beyond the basics.

Suggest reviewing this before any conclusions about what I may or may not know about brakes:

Click to expand...

The master cylinder bore is an easy factor to change, much easier than the brakes themselves since in this case that usually requires different spindles. Matched properly it would be better to have the larger piston area. Same for rotor thickness- we're talking about the same car, so, vehicle weight is the same. The 1" thick rotors do experience fade in hard driving conditions, so, the .75" rotors would only be worse. So how does that make them better brakes?

I don't understand your thermodynamics statements at all. The sole function of brakes is to convert mechanical energy into thermal energy. That is what they do. While I understand you don't need thermodynamics to tell you how to calculate the clamping force of a set of calipers, you do need thermodynamics to tell you if your braking system will actually work in the real world. If you only possess a rudimentary understanding of thermodynamics, how do you go about designing a more efficient braking system? Brake fade, due to heat, is by far a more important factor than simple clamping force if we're talking about real world use. I would much rather have brakes that resisted fade and maintained their braking capabilities, but had slightly less clamping force, than a set of brakes the had amazing clamping force and were cooked (and therefore useless) after two corners.

And, I read the thread you linked. A thread where you talk about things you've already laid claim to here, namely your vast experience designing brakes. But then you also go and say things like you "struggle to understand" the concept of only using one side of the caliper to calculate piston area in calculations for fixed calipers. It isn't all that difficult of a concept and one I would think someone that has actually designed fixed caliper brakes would have a really good understanding of. Sorry, but that only leaves me even more confused as you what you do, or do not, know.