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

Before leaving the driver's seat or getting under a vehicle during inspection, what must be true?

The spring brakes are applied or the wheels are securely blocked The trailer service line is left open The engine is racing above idle The low-air warning is unplugged

Correct Answer:

The spring brakes are applied or the wheels are securely blocked

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