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      09-29-2020, 03:18 PM   #10
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Drives: E92 M3,G20,F22 240iX,F82 M4
Join Date: Jun 2009
Location: Mid-Atlantic

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Originally Posted by Captain Caveman View Post
Indeed. I am asking about piston size in isolation of disc diameter for the time being, as it has a direct impact on pedal travel and firmness, as well as the degree of modulation available. Most aftermarket BBKs offer increased disc diameter and larger pad area, for example the equivalent Stoptech kit, yet their kit retains a total piston area only 1% different to stock.

I'm curious as to the reason for the reduced piston area on AP kits, as it's not the first time I've noticed that they tend to go for smaller total piston areas (seen it before on Evo AP kits). There is obviously a reason for this, and being little more than a novice in this area myself, I'm very interested to understand the rationale. I for one hate a mushy pedal, and like the reassurance of a firm one when pressing on, so perhaps this is the reason they've done this?

I'll leave the Essex guys to spread the knowledge.

That would be fine but you said itís also down on torque by 9.4% which is force x distance and, therefore, requires the rotor radius to be accounted for in your calculations.
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