Combination Test - Texas CDL | 100% Correct Answers

In coupling, just before the tractor is coupled with the trailer you should: - connect the emergency and service air lines. In coupling, you should not move the tractor after it is coupled until you push in the air supply knob and: - wait until the air pressure is normal. What happens immediately if the service air line comes apart while driving, but the emergency line is okay? - Nothing is likely to happen until you press the brakes. In coupling, before you back under the trailer, how do you lock the trailer brakes? - Pull out the yellow air supply knob. For the coupling to be complete, the safety catch for the fifth wheel locking lever must be: - over the locking gear. What is the air leakage rate for a combination vehicle with the engine and brakes off? - Less than 3 PSI per minute. What is the maximum air leakage rate for a combination vehicle with the engine off and the brakes on? - 4 PSI per minute. A driver crosses the air lines when hooking up to an old trailer. What will happen? - If the trailer has no spring brakes, he or she could drive away but wouldn't have trailer brakes. To unlock the fifth wheel, pull the release handle to the: - open position