Which of the following is NOT part of checking that air is flowing to all trailers?
a) Going to the rear of the rig
b) Pressing the pedal several times to lower the air pressure
c) Pushing in the red "trailer air supply" knob
d) Opening the emergency line shut-off valve
Answer: b) Pressing the pedal several times to lower the air pressure
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.