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

What is the purpose of the bobtail proportioning relay valve?

To adjust the governor cut-in pressure when driving bobtail To reduce the braking pressure sent to the tractor's rear brakes when driving without a trailer To lock the tractor's front wheels during emergency stops To automatically apply the trailer parking brakes if gladhands disconnect

Correct Answer:

To reduce the braking pressure sent to the tractor's rear brakes when driving without a trailer

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