For some damn reason the brakes on my trailor quit working. when the truck brake is applied, the controller just gives and error. I tested the output from the truck and its all gravy. I checked all the wiring under the trailor, visually it seems ok. I found one questionable spot, but cut the wires and respliced to make sure. The ground is good. I took the wheels and hub off and the brake pads are like new, and the wiring in the hub seems good. Anyone to guess what could go wrong with my brakes. BTW, all the lights are functional. Just no brakes.