Saskatchewan Air Brake Practice Questions - Saskatchewan Air Brake (Endorsement A) Exam

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How does the bobtail proportioning relay valve distinguish between a tractor towing a trailer and a tractor operating bobtail?

It uses an electrical sensor connected to the trailer light plug It detects whether there is pressurized air in the trailer supply line gladhand circuit It measures the weight on the fifth wheel plate mechanically It monitors the engine throttle position sensor to calculate load

Correct Answer:

It detects whether there is pressurized air in the trailer supply line gladhand circuit

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