i had the same problem with old frod 2 n, the brakes just got dirty, some leakage, and rust, and they would not stop the tactor , even on a slight incline( how i ended up in the ditch) /forums/images/graemlins/crazy.gif try pulling the wheels off and cleaning the brakes, worked for me. know they are heavy but an extra pair of hands or a chain fall will allow u to do it. just be careful