70% of all braking comes from the front just like a motor cycle. This happens because the weight shifts forward and thus the tire makes more contact creating more friction and thus the 20% difference.

The rear just locks up and that is that....IMHO

 

yes youa re correct hydra, the front brakes do alot more of the work bc that is where all the weight shifts too, its the same on a motorcycle, or a bike, or anything really