Air Brake (Q Endorsement) Practice · Question
What colour is the gladhand connection for the service (supply) line on an air-braked trailer?
The service line gladhand (sometimes called the control line) on an air-braked trailer is typically coloured blue, differentiating it from the red emergency/sup
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Question: What colour is the gladhand connection for the service (supply) line on an air-braked trailer?
Answer options: ✅ Blue.
- Red.
- Green.
- Yellow.
Correct answer: Blue.
Explanation: The service line gladhand (sometimes called the control line) on an air-braked trailer is typically coloured blue, differentiating it from the red emergency/supply line.
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