Can my cantilever brake pads not being centered lead to a problem? I just watched a Park tool video on cantilever brake adjustment.
The mechanic pointed to a small screw and said it was to center the brake pads but did not say why. Obviously two forces that oppose each other should be applied evenly. My question is,can uneven application of the brake pads lead to a problem other than inefficient braking.
On rim brake calipers the cable pulls the two sides towards each other to 'pinch' the rim. If one pad contacts the rim first it will not exert any significant force until the opposite pad contacts the rim.

Centering the calipers allows the distance between the pads and rim to be minimized, thereby reducing the distance the lever has to be moved before braking force starts to be exerted.