I'm wondering if I need new brake shoes. I bought an older Raleigh as a beater bike, and had it out for the first time today. When I pull the brakes, I get great contact, but not a whole lot happens. Could the rubber have hardened over time (the bike is an 84)? The bike just keeps going...and going. It eventually stops, but I have to REALLY jack on the brakes in order to get a fast stop. Wheels are true, and the brake cables have no kinks or anything else wird going on. Any ideas??? Thanks!