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

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A tractor-trailer loses 5 psi in one minute during the applied air-loss test after the initial application drop. How is it judged?

Fail, because a tractor and one trailer is limited to 4 psi per minute Pass, because all combinations may lose 6 psi Pass, because the initial drop is added to the limit Fail only if the ABS lamp is on

Correct Answer:

Fail, because a tractor and one trailer is limited to 4 psi per minute

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