Class 1 Commercial Driver Practice · Question
When uncoupling a semi-trailer from a tractor, what is the first step after parking on level ground and applying the trailer parking brakes?
The first critical step after securing the trailer brakes when uncoupling is to lower the landing gear until the feet are firmly on the ground. This supports th
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Question: When uncoupling a semi-trailer from a tractor, what is the first step after parking on level ground and applying the trailer parking brakes?
Answer options:
- Disconnect the air lines and electrical cable ✅ Lower the landing gear until it makes firm contact with the ground
- Raise the suspension in the tractor
- Release the fifth wheel locking mechanism
Correct answer: Lower the landing gear until it makes firm contact with the ground
Explanation: The first critical step after securing the trailer brakes when uncoupling is to lower the landing gear until the feet are firmly on the ground. This supports the trailer weight when the tractor is pulled away. This is a standard procedure outlined in commercial driver handbooks.
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Question explanations
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