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

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Explain how a modulator valve operates to control trailer spring brakes in a dual-circuit system if a primary system failure occurs.

It completely isolates the trailer spring brakes so they cannot apply It routes service brake control pressure to release the trailer spring brakes gradually, allowing the driver to control deceleration It increases compressor output to bypass the primary circuit leak It switches the trailer service brakes to hydraulic operation automatically

Correct Answer:

It routes service brake control pressure to release the trailer spring brakes gradually, allowing the driver to control deceleration

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