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A lot of good ideas have been stated above. A year ago I had no brakes on one axle. It turns out to be bare wire areas inside the axle that had been caused by the wiring abrading inside the axle tube. A quick test of magnets being energized was done by temporarily clamping the dash control levers together and then listening for a humming sound at each wheel. Even as a hearing challenged old guy I was able to hear the sound at the working magnets. No sound, no operating magnet, then no brakes. The bare abraded wires allowed the power to go directly to ground rather than the windings if the magnet.
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