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

Why is it wrong to use the trailer hand valve to hold a loaded combination at a dock?

It applies spring brakes only below 150 psi Parking must be done with ABS only Ontario warns the trailer hand valve must never be used for parking It controls only the compressor governor

Correct Answer:

Ontario warns the trailer hand valve must never be used for parking

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