Question 32 - Doubles/Triples Test Practice Test for the CDL

You are driving a triple trailer and the emergency brakes for all three trailers have come on. What is most likely to have caused this?

The emergency line has lost air pressure.
There is an electrical short in the tractor.
None of these is correct.
The emergency brake of the tractor has come on.

Hint

Be alert for words like better, best, most, main, major, and primary/primarily in questions. They indicate that there might be other answers that could work, but the correct answer is the one that is the best of the choices given.

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