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6 Cards in this Set
- Front
- Back
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Why should you not use the trailer hand valve while driving? |
The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. |
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Describe what the trailer air supply control does. |
The trailer air supply control on newer vehicles is a red eight-sided knob, which you use to control the tractor protection valve. |
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Describe what the service line is for. |
The service line (also called the control line or signal line) carries air, which is controlled by the foot brake or the trailer hand brake. |
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What is the emergency air line for? |
The emergency line (also called the supply line) has two purposes. First, it supplies air to the trailer air tanks. Second, the emergency line controls the emergency brakes on combination vehicles. |
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Why should you use chocks when parking a trailer without spring brakes? |
it is very important for safety that you use wheel chocks when you park trailers without spring brakes. |
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Where are shut-off valves? |
Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers |
