Practice question

On an icy downgrade, why is using the trailer hand valve as the main brake especially unsafe?

It can apply only trailer brakes and contribute to skid or jackknife risk; the foot valve should be used for service braking
It improves steering by locking the trailer wheels
It is required by ICBC for all downgrades
It charges the tractor reservoirs

Answer: A — It can apply only trailer brakes and contribute to skid or jackknife risk; the foot valve should be used for service braking

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