SGI Class 1 Practice Questions - Saskatchewan Class 1 Commercial Driver Licence Written Exam

Why is the use of the trailer hand valve to park a vehicle dangerous?

It drains the battery overnight It relies on air pressure, which can leak down over time, causing the brakes to release It damages the engine control module It causes the steering column to lock up

Correct Answer:

It relies on air pressure, which can leak down over time, causing the brakes to release

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