Practice question

What is the danger of relying solely on the foot brake to hold a heavy commercial truck stationary on a steep uphill incline?

If the driver's foot slips, the loaded vehicle will roll backward instantly into following traffic; the parking brake and proper clutch/throttle coordination must be used
It causes the engine oil filter to blow off
It causes the trailer kingpin to bend in half
It drains the battery within 10 seconds

Answer: A — If the driver's foot slips, the loaded vehicle will roll backward instantly into following traffic; the parking brake and proper clutch/throttle coordination must be used

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