Be sure to secure the white ground wire to the frame. LOCK OUT KEY for UFP Surge Brake Trailer - Magnetic with Heavy Duty Strap - Made in the USA. That is, it will not open if it were to malfunction so the user will always have brakes when towing forward. A "click" should be heard when the tow vehicle is shifted into reverse and the back-up lights come on. The electrical lead from the solenoid valve (usually a blue wire) must be connected to the tow vehicle's back-up lights. Once the lockout has been activated, you can back up your trailer without triggering the trailer brakes. To activate the lockout, just rotate the tab on the side of the actuator to the left. Brake Fluid is routed back to the actuators master cylinder reservoir, no line pressure builds up and the trailer can easily be backed up. This manual lockout easily installs on any Demco DA91 hydraulic brake actuator so that you can back up your vehicle without your trailer's brakes locking up. Necessary for disc brake use, This electronically activated reversing solenoid prevents hydraulic pressure buildup whenever the tow vehicle is shifted into reverse. Trailer Buddy/UFP Electric Reverse Solenoid Valve with Fittings #34500
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