It seems that the brake system get over engineered thinking that it will be better than the original and we tend to lose the plot with large calipers and discs only to find exactly what this thread is about.
The donor whatever it is weighs possibly three times the Roadster and the brakes are made accordingly.
The clamping force is paramount and size is secondary,but larger is better with regard to heat dissipation.
Pad material again is a consideration as you need vehicle mass and pedal pressure to generate heat and the Roadster is light.
I go back to my post and still think its the mixture of parts that is mismatched with regard to m/cyl bore and caliper piston sizes.
Larger discs will require bigger carriers.
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