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Second shot...there will be many more.
Its the same pavement, but not the same tires...but I don't think that
is a big issue. I suspect that the limiting factor is the temperature
of the brake pads, since if they get too hot, the friction coefficient
drops catastrophically.
So heavier trucks have more KE...takes more work to stop
them...generates more temperature increase, unless you limit the
rate of loss of mechanical energy by not braking so hard...hence the
longer stopping distance.
The brake force is not a function of the weight of the vehicles
The
difference in stopping distance between trucks and cars (as between
different makes of cars) is tied up with the brake design.
In the case of
trucks, I also suspect the longer distances are due to a compromise between
safety and brake life--that is, while brakes could be designed to stop the
trucks in a shorter distance, they would tend to wear out much faster.