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Make sure the brake are properly adjusted, that you got the ground on the right wire, that the brake wire from the truck goes to the brake wire on the trailer & it should work(don't forget that those trailer braking system are braking only in foward motion) If you hot wire the brake(12+ to the brake wire) & it's not braking in foward motion, you may have a magnet in the wheel which is open or a bad connection(corrosion), mostly if the connections are not sealed & you're north of salt belt.
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