A Driver Is Bringing a Tractor-Trailer Combination to a Gradual

question 71

Multiple Choice

A driver is bringing a tractor-trailer combination to a gradual stop using the trailer service brakes only.A vehicle cuts him off and he reacts by hitting the treadle valve with panic stop force.Which source circuit supplies the trailer service signal from the tractor at the time of the panic application?

• A) primary only
• B) secondary only
• C) both primary and secondary
• D) trailer onboard supply

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