How do I add a second parking brake to my service vehicle?Question:I have a tandem truck with a 3,000-gallon tank and was considering adding a parking brake to the rear axle. The middle axle has a parking brake, but I would feel a lot safer with both the tandems locked when I am pumping. I have a lot of grades I park on during service. Has anybody done this? I was just wondering about the feasibility of this; it seems pretty simple to do. Answers: It is fairly simple, I think. You probably need either a spring brake valve and/or
