Why should you NEVER unlock the pintle hook with the dolly still under a trailer?

a.It will damage the pintle hook

b.The drop bar ring hitch may fly up and cause serious injury

c.The air lines will disconnect

d.The trailer brakes will lock up

Explanation

You should never unlock the pintle hook while the dolly is still under a rear trailer because the ring hitch on the dolly tongue can fly up, potentially causing serious injury or death. Always secure the dolly before unlocking.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Double/Triple Endorsement Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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