You’re doing it again mate! It doesn’t have any relevance[emoji23] Your first point which I could just about make out, was very wrong indeed. A car that ‘needs’ heavier braking doesn’t necessarily need to be heavier or faster/more powerful - it’s just the speed at which they want to decelerate. F1 cars are insanely light but require going from 100-0 in less than 2 seconds. The limiting factor is tyres, as to which i have 275s all round. I would also only put ceramic brakes or high performance pads under the category of potential ‘under braking’. Steel discs themselves wouldn’t, in my opinion. Their frictional coefficient decreases as heat increases, whereas ceramics and high performance pads are the opposite. The purpose of discs is to provide a mating surface for the pads and to dissipate the heat generated from the friction caused by the rotation of the wheels.