Air Brake (Q Endorsement) Practice · Question
Glad-hand colour coding on trailer air lines is:
Red glad-hand = emergency/supply line. Blue glad-hand = service/control line.
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Question: Glad-hand colour coding on trailer air lines is:
Answer options:
- Red = service, Blue = emergency ✅ Red = emergency (supply), Blue = service (control)
- Both red
- Both blue
Correct answer: Red = emergency (supply), Blue = service (control)
Explanation: Red glad-hand = emergency/supply line. Blue glad-hand = service/control line.
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