It would't hurt to take a little sand paper or emeryboard to scuff the pads and even some steel wool on the rims then rubbing alcohol on the rims to clean all the dirt and grit off.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk