Originally Posted by
noglider
Are you sure they have more leverage?
Yes.
Do the shoes move less for a given amount of lever travel at the handlebar?
Yes, but that's OK because they don't rely on a spring for centering which allows for tighter pad to rim clearances.
Mechanical advantage is about 4:1 with conventional side-pull brakes and levers versus 5.6:1 for dual-pivots.