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Combination Test - Texas CDL Questions with Correct Answers and Answers with Verified Solutions | Latest 2026 Update

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Combination Test - Texas CDL Questions with Correct Answers and Answers with Verified Solutions | Latest 2026 Update

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Combination Test - Texas CDL Questions with Correct Answers and
Answers with Verified Solutions | Latest 2026 Update




Q: What is the purpose of the emergency air line?

Answer:
To supply air to the trailer air tanks AND To control the emergency brake on
combination vehicles. What is the usual color for the emergency line couplers? red
Why should you lock the air hose couplers to each other when not in use? To keep
dirt and water out of the lines. On an old trailer without spring brakes, what happens
when you cross the air lines? You could drive away, but have no trailer brakes. Most
trailers built before 1975 have no parking brakes because: They don't have spring
brakes. Why should the fifth wheel be completely greased? To prevent steering
problems. In coupling, where should the tractor be lined up? Directly in front of the
trailer. In coupling, when is the trailer at the right height? When the trailer will be
lifted slightly when tractor connects. In coupling, how can you make sure the air
lines are not crossed? Pump the brake and you will hear the brakes move and air
escape. How do you check the security of the kingpin and fifth wheel connection?
Pull ahead gently with the trailer brakes locked.

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