BC Class 1 Commercial Practice Questions - British Columbia ICBC Class 1 Commercial Driver Knowledge Test Exam

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

Correct Answer:

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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