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These valves permit closing the air lines off when another trailer is not being towed. Prev Next What are shut-off valvesDesigned to turn off the truck engine when a brake failure occursThe yellow and red air control knobs located in the cab of a truckUsed in the service and supply air lines at the back of trailers used to tow other trailersPlaced at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too highQuote From The CDL Manual:Shut-off valves (also called "cut-out cocks") are used in the service and supply air lines at the back of trailers used to tow other trailers. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. Join Us! We have an awesome set of tools that will help you understand the trucking industry and prepare for a great start to your trucking career. Trailer Service, Parking and Emergency Brakes Newer trailers have spring brakes just like trucks and truck tractors. What is the emergency air line for? Why should you use chocks when parking a trailer without spring brakes? Where are shut-off valves? Study section 6.2 if you can't answer all of these questions. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Next Trailers built before what year may not be equipped with trailer spring brakes?1970199019751985Quote From The CDL Manual:Newer trailers have spring brakes just like trucks and truck tractors.