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14 Cards in this Set
- Front
- Back
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The trailers reservoir is filled with air through the: |
Supply line. |
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When the air line is broken, tractor pressure should not drain below; |
20 p.s.i. |
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If the foot valve and hand valve are operated at the same time, the trailer application pressure will be: |
The highest pressure being applied, hand valve or foot valve. |
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The main purpose of the tractor protection valve is: |
To prevent loss of air from the tractor if the trailer breaks away. |
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What will occure is the supply line ruptures? |
The trailer brakes will apply immediately. |
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When the trailer is disconnected and parked you would: |
Block the wheels. |
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Air lines should be attached to the trailer prior to backing under, then: |
Release trailer brakes, apply hand valve full on. |
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What valve is not required on truck or a tractor? |
Relay emergency valve. |
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What valve supplies air to the trailer? |
The trailer air supply valve. |
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A leak at the hand valve exhaust port when the foot valve is applied would most likely be caused by: |
A defective two-way check valve. |
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Tractor protection systems must shut of air supply to the trailer when: |
The supply line is ruptured. |
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Which will cause trailer brakes to dynamite? |
Loss of pressure in the supply line to trailer. |
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The most common cause of air loss in a tractor trailer system is: |
Defective glad hand seals. |
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If a trailer breaks away from a tractor , the trailer brakes must hold in a full emergency application for at least: |
15 minutes. |
