Originally Posted by
fietsbob
Newtonian physics is at work, and that is why the front brake is more effective.
My question wasn't about front vs. rear. I am comfortable getting most of my braking with the front, and I understand the physics (well enough...) behind it. My question (which has been well answered now) was about whether my terrible stopping power with the back was expected or not. It is not, and now I understand the problem.