http://imageshack.us/photo/my-images/846/dsc1553v.jpg/
im having some dificulty with my brakes. i fabricated this piece from an old walmart bike and cut it off and then welded it onto the frame. sometime when i brake going at speed about 16 and can brake at a pretty good rate with pads fully aplied. and at other times fully applied it takes a long time to brake and i feel very unsafe. i sanded the rim to try and give the pads a little grip. do i just need new pads, im lost brakes are important i need them. please give me your experience I NEED HELP