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@chris_crash
some one said that we could stop at about 0.5g with a front break, and cars at 0.8g, so they would have roughly 60% more stopping power.
they would also have more mass, a lot more mass, greater then 60% more, so i at the same speed would have more velocity and therefore a longer stopping distance. i would also hazard a guess that the 0.8g is for all four wheels with the pedal break, while the 0.5 is for just a front.