Finally, a few thoughts on brake design as an ME who has never designed brakes. I don't understand why people say drum brakes can't stop a car. If they can lock up the wheels, that is sufficient (actually too much, so pump them). The main problem is they can't do this repeatedly. ...One advantage of drums is the amplifying effect as the shoes jam against the drum, so you can get by w/ manual brakes. However, if the shoe suface gets sticky they can lock up.