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

Which statement describes service brake priority on a trailer?

The trailer hand valve becomes the parking brake Supply and service lines can be crossed safely The service brake air tank fills before the spring brake tank releases the trailer for towing Spring brakes release first even if service air is low

Correct Answer:

The service brake air tank fills before the spring brake tank releases the trailer for towing

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