recently I had my tire tear and tube pop so I had to take off my back wheel to get it all fixed. In order to get the rear wheel off I had to take the brake cable out out of the bolt that was holding it. I put my new tube and tire on and now can not seem to get the rear brake working again. I have the brake wire held in with the bolt and the inner braking system seams to be working fine, it just might not be expanding enough. anyone know how to fix this problem. I'm a total rookie when it comes to mopeds this is my first, any help will be appreciated.