Apologies as I can't be bothered to read through 9 pages of posts. I read through the first page and noticed a common misconception "To put it simply, your brakes (if working correctly) do not dictate how long it will take a car to stop, your tyres do." While this is correct at low speeds it is not at high speeds. If you slam your brakes on in any car, you'll never lock your wheels up above, say, 40mph, on dry tarmac. Bigger brakes allow the discs to cool quicker, bigger pads (or better pad materials) and bigger calipers will allow your car to stop quicker above (say) 40mph. As you pointed out at low speeds braking is dictated almost entirely by the friction between the tyres and the road.