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CDL Combination Practice Test Questions
and Correct Answers the Latest Update
and Recommended Version
You're hooking up a tractor to a semi-trailer and have backed up but are not under it. What
should you do before backing under the trailer?
✓ Hook up the emergency and service air lines.
After pushing in the trailer supply valve, you should not move the tractor
until air system is?
✓ At normal pressure
There are two things you can do to prevent a rollover. They are: Keep the cargo as close to
the ground as possible, and:
✓ Reduce speed before entering turns.
With the engine off and the brakes released, a combination vehicle air brake system shouldn't
leak more than how many psi in one minute?
✓ 3 psi
The fifth wheel locking lever isn't locked after the jaws close around the kingpin. This means
that:
✓ The coupling is not correct and should be corrected before driving the coupled unit.
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