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

What is the purpose of the tractor protection system's trailer supply valve (red knob)?

To supply air pressure to release the tractor parking brakes To control the flow of supply air to charge the trailer reservoirs and open the tractor protection valve To adjust the front steering axle brake application pressure To release the caging bolts in the trailer spring chambers

Correct Answer:

To control the flow of supply air to charge the trailer reservoirs and open the tractor protection valve

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