I may not have
it adjusted just right ether.
Fly
my money is on this lil factor.
they can be fiddly to setup...
how to explain to do them?...
insert new pads, only finger tighten nuts.
pop rubber band around arms to hold em shut to the rim.
square them up to the rim, ensuring that as they wear, they wont start chewing sidewalls.
also make sure that (due to slop) when you apply the brakes and they try rotating under load, that the shoe still wont hit the sidewall.
they also need to be completely on the rims, no overhangs!
then!
that rotation from applying the brakes works two ways.
youll find that the fronts of the shoes tend to come apart as the arm rotates slightly( under braking load). or, vice versa, the rears of the pads get closer together.
so we give the pads a touch of pre rotation, or "toe-in", so the front of the pads touch first. then, under load, they rotate slightly and the ENTIRE pad comes into contact with the rim.
something about 1-2mm thick at the rear of the pad, as you finally tighten them up, usually gives just enough toe-in.
sounds complex, takes all of two minutes
then you can fiddle with the cable, the balancing screws, and yay! stop like a dead elephant
there is virtually NO bed in. they either work perfectly out of the box or somethings wrong...