If you pull back on the main handle to set the brake and then push the movable handle forward does the brake set?
If that works then the handle spring is broken, one end of the spring fits in a hole on the main handle and the other end rides against the inside of the movable handle...clear as mud right?
If you need a picture, send me a PM with your email address and I'll go take some for you.
If you band needs a new lining you can take it to a big truck brake shop and they can reline it for you.
Mike B
