Back-up solenoid valve that allows free back-up of trailers with surge brakes. Solenoid valve is an electrically actuated, normally open valve. When 12 volts is applied to the solenoid (hook-up into reverse light circuit of tow vehicle), solenoid valve closes, shutting off the flow brake fluid to the wheel cylinders. Trailer can be backed-up without the brakes being activated. Solenoid valve is plumbed into the exit tube of the surge brake actuator.
- Model: 73846