Describe what the trailer air supply control does. Stops air from flowing to trailer red air line. Cdl Air Brakes S 6 2 Combination Vehicles New York State Cdl Air Brakes Pass Cdl License The emergency line also called the supply line has two purposes. . When coupling a tractor-semitrailer to test the trailer air brakes you should place the tractor protection valve control in what position. It is used to supply the trailer with air shut the air off and put on the trailer emergency brakes. After coupling how much space should be between the upper and lower fifth wheel. You push it in to supply the trailer with air and pull it out to shut the air off and put on the trailer emergency brakes. It is a device used to keep the trailer behind the tractor. It is used to supply the trailer with air shut the air off and put on the trailer emergency brakes. You are coupling a tractor to a semi trailer. When coupling a...
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