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

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At what trailer supply-line pressure range does the trailer supply valve automatically close when air escapes or a trailer breaks away?

20 to 45 psi 80 to 100 psi 100 to 120 psi 145 to 150 psi

Correct Answer:

20 to 45 psi

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