Driving Course > EXAM > Texas CDL Combination Test | 45 Questions & Correct Answers (All)
Texas CDL Combination Test | 45 Questions & Correct Answers
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Texas CDL Combination Test | 45 Questions & Correct Answers In coupling, just before the tractor is coupled with the trailer you should: - ✔✔connect the emergency and service air lines. In coupl... ing, 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 [Show More]
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