Not a stupid question ----- and you answered many yourself.
Pad (swept) area
Clamping force (piston size - # of pistons etc)
Larger ROTOR --- 1) Think of this as LEVERAGE -- the farther away the caliper is from the hub - the more clamping leverage. 2) THICKER / Larger diameter Rotor displaces more heat
Thicker rotor has less flex
Better CALIPERS have less flex and more clamping power
PAD thickness and composition and pad choices
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