They also make a full mechanical line lock...no solenoids, no juice!. I put one on a Cat forklift at work. They work as Grigg described, but one always wonders if the little valve will leak, and your brakes will slowly release as you sit with your girlfriend in the Chinese restaurant eating Moo-Shoe-Poorrk! The Chinese restaurant on the steep hill, near the dock by the bay.
Stuart-san
