This winter my CX-70's seemed to be dragging against the rim. Upon closer inspection I found that the bushing was binding on the brake arm. It is a non-serviceable part since it is pressed together, no options to re-grease. They came on my QB that I bought used, so I don't know how old they are. Could be rust or grit, who knows? Can't take them apart to find out. I replaced with Tektro 720's. At least they open and close like they are suppose to.
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