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You are assuming a linear relationship between heat and  rotor size. Grashofs formula shows that the relationship is  not. I am not arguing that there will be no difference  between a BBK and the stock sized rotors, just little  difference. & that under the circumstances the rotor size  had no relation to the accident since the issue was in the  ability to cool the fluid & caliper, not the pad contact  surface. Remember the pedal went to the floor characteristic of  boiled fluid, not the pedal was hard with no braking  characteristic of the brake pad contact surface heating past  the point where it can retain it's coefficient of friction.  J 
 
 
 
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