I have been trying to understand how the hand-brakes in my car function-and hence I read-up on brake drums and their functioning. Reasoning that one brake shoe(i.e 1 friction shoe out of a total of 2) always gets worn more than the other: if its a leading-trailing shoe type In common-usage, brake drums have an hydraulic force applied(see diagram, F_e) and depending on the direction of rotation of the drum,we can have a leading-shoe and a trailing-shoe. I think the trailing-shoe gets more worn-out than the leading-shoe because there is a partial cancellation of the forces (as explained in the diagram) i.e a de-amplification of the input force. Is it true in reality? Does one brake-shoe get more worn-out than the other as a theoretical force analysis suggests? 2.Also,can someone provide an insight into the term 'shoe-factor' that most brake engineers use to describe the self-amplification capacity of brakes? How does knowing this value help in racing?