SGI Class 1 Practice Questions - Saskatchewan Class 1 Commercial Driver Licence Written Exam

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During a dual air brake system pre-trip inspection, how do you verify the tractor protection valve operates automatically?

By driving at 30 km/h and stepping on the brake pedal By shutting off the engine, releasing the parking brakes, and pumping the service brake pedal repeatedly until air pressure drops to between 20 and 45 psi, at which point the trailer supply valve (red knob) must pop out By disconnecting the electrical cable while the engine is running By checking if the valve is free of rust

Correct Answer:

By shutting off the engine, releasing the parking brakes, and pumping the service brake pedal repeatedly until air pressure drops to between 20 and 45 psi, at which point the trailer supply valve (red knob) must pop out

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