I'm disappointed with the stopping power of the front side pull brake I put on my Cranbook. The wheel has the stock alloy rim and the brake is adjusted properly but the pads just don't grab well. I've tried different pads from a Specialized I have that work fine on it but still seem to slide on this wheel. Is it the metal/surface? I don't really want to depend on the coaster brake. Anyone else with a similar problem? Thoughts or suggestions? "I don't need brakes!"