Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck equipped with an air brake system has a warning light illuminate, indicating low air pressure. At what approximate pressure (in kPa) would this warning typically activate?
In most air brake systems for heavy-duty vehicles, the low air pressure warning light and buzzer are designed to activate when the system pressure drops below a
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Question: A heavy-duty truck equipped with an air brake system has a warning light illuminate, indicating low air pressure. At what approximate pressure (in kPa) would this warning typically activate?
Answer options:
- 55 kPa
- 100 kPa
- 250 kPa ✅ 415 kPa
Correct answer: 415 kPa
Explanation: In most air brake systems for heavy-duty vehicles, the low air pressure warning light and buzzer are designed to activate when the system pressure drops below approximately 415 kPa (60 psi) to alert the driver of a potential issue.
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