Ontario Air Brake Z Test Practice Questions - Ontario Air Brake (Z Endorsement) Knowledge Test Exam

How does a dual air brake system improve safety?

It removes the need for low-air warnings It lets the driver ignore gauges It uses primary and secondary circuits so one circuit can still provide braking if the other fails It makes stopping instant at any weight

Correct Answer:

It uses primary and secondary circuits so one circuit can still provide braking if the other fails

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