California CDL Air Brakes Test

How should you safely apply the trailer brakes only, for example to test the trailer's emergency function?

With the foot valve By pulling the red 8-sided trailer air supply knob OUT, which exhausts the supply line and applies the trailer spring brakes Using only the parking brake Disconnecting the glad hands

Correct Answer:

By pulling the red 8-sided trailer air supply knob OUT, which exhausts the supply line and applies the trailer spring brakes

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