Prática CDL air brakes

A bus has dual parking control valves and a separate air tank. Main air pressure was lost and the spring brakes came on in a travel lane. You hold the spring-loaded valve in to release the spring brakes. What should you keep in mind?

• AThe separate tank refills from the spring brakes as you drive.
• BThe valve releases the spring brakes until main air returns.
• CThe separate tank allows you to finish the route at low speed.
• DThe separate tank holds air for only a few releases, so plan the move.