look on the web at superwinch, the champion winches are just old superwinch designs, there isnt really much to them, motor on one side gearbox on the other, brake inside the drum. i would bet the problem is the brake is seized inside the drum, remove the winch from its mount and unbolt the bars that cross the drum holding the two parts together. there is a hex shaft inside pull that out, the brake should then come out from inside the drum, it will have three shoes that are loose you are then left with two cones with concentric threads, this will be dry or siezed keeping the brake on , clean and grease the threads but not the shoes obviuosly, then rebuild.
