BC Air Brake Practice · Question
What does a steady red low-air warning light indicate in a commercial vehicle with air brakes?
A steady red low-air warning light indicates that the air pressure in the primary or secondary circuit has fallen below the safe operating minimum, typically 60
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Question: What does a steady red low-air warning light indicate in a commercial vehicle with air brakes?
Answer options: ✅ System air pressure has dropped below 60 psi (414 kPa).
- The parking brake is applied.
- There is a loss of engine oil pressure.
- The air compressor is malfunctioning.
Correct answer: System air pressure has dropped below 60 psi (414 kPa).
Explanation: A steady red low-air warning light indicates that the air pressure in the primary or secondary circuit has fallen below the safe operating minimum, typically 60 psi (414 kPa), and is a critical warning as per provincial air brake manuals.
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