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4:40
cdlcollege.com
CDL Class A: Combination Vehicles. Driving And Coupling
You're pulling a trailer with an air release valve on the back of the trailer. How can you tell if air is running through the system? Push in the red trailer air supply knob, to supply air to the emergency line, pull down the trailer hand valve (johnson bar) to charge the supply line, go to the rear of the trailer and open the emergency valve ...
May 16, 2020
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