I guess I will jump in here. From what I have gathered from the article that is attached. Maintaining tire grip to road surface is criticle for effectiving braking to say the least. Generally speaking, additional weight load and I quote
The maximum braking force that a particular tire can generate is theoretically equal to the coefficient of friction of the tire-road interface multiplied by the amount of weight being supported by that corner of the car.
I take this to mean that weight that the tires are supporting has a direct relationship in the ability of a tire to apply maximum braking effort. Since most of the weight of the Contour is on the front end, I would take this to mean that more effective braking is accomplished in the front compared to the back which is very light. Since the backend is very light, increasing rear bias could create a very dangerous situation - since the tires would tend to lock-up more and you would lose control due to the light back end. Of course one way to compensate for this would be to add more weight to the backend of the car.
In my general observation, it seems that the front end should handle the major load in braking the car due to the weight it is supporting and the fact that the backend is light and would not provide equal braking ability as compared to the fronts.......
Bob
P.S. And I don't even mention the additional weight added to the front from dynamic load shifting........
http://bobt.gotdns.com/brake.htm