All ActivityMost RecentMost LikesSolutionsRe: Unified Tow Brake help wantedI have been having a problem where the solenoid wouldn't retract any more but with a tech supports help we isolated (I hope) to a defective computer box - by measuring voltages to the solenoid. He said that that the solenoid almost never fails and that sounds so in your system. The only 2 other parts would be the controller on your dash and the computer box under the dash. If your brake away switch activates what you say I would think it is the darn computer. If you are in the US Amazon has them for about $319.00. I would spend the time and phone the company. Keep calling until you get a human. He was really helpful and I hope when my new computer arrives it will fix my problem. Good luck - it is a great system when working. Again reviewing your problem I am inclined to also question your dash unit since I believe that is the component that sets the proportional braking. Let us know the results.