Class 1 Commercial Driver Practice · Question
Glad-hand colour coding on the trailer air lines is:
Red glad-hand connects the emergency (supply) line; blue connects the service (control) line.
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Question: Glad-hand colour coding on the trailer air lines is:
Answer options: ✅ Red = emergency, Blue = service
- Red = service, Blue = emergency
- Both red
- Both blue
Correct answer: Red = emergency, Blue = service
Explanation: Red glad-hand connects the emergency (supply) line; blue connects the service (control) line.
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Question explanations
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