Can somebody give me some advice on getting my Sachs front wheel drum brake to actually brake? The cable and all is working fine, but no matter how much force I use, the brakes just don't do anything more than slow the bike down a bit. I've cleaned the drum and brake pads, and that seemed to help a little, but still not much grab. Should I sandpaper or scratch up the inside surface of the drum to give the pads something to grab hold of?