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

What air pressure is used while measuring applied pushrod stroke under Ontario's procedure?

145 to 150 psi with safety valve venting Any pressure if the trailer hand valve is pulled 90 to 100 psi with engine shut off and service brakes fully applied 20 to 45 psi with spring brakes applied

Correct Answer:

90 to 100 psi with engine shut off and service brakes fully applied

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