What is the release handle on a fifth wheel used for?

a.To release the trailer brakes

b.To unlock the locking jaws so the kingpin can be released during uncoupling

c.To release the air from the trailer tanks

d.To lower the landing gear

Explanation

The release handle on the fifth wheel is pulled to unlock the locking jaws during the uncoupling procedure. This allows the kingpin to slide out of the fifth wheel as the tractor pulls away from the trailer.

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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.

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