Air Brake Coach
System partsQuestion 12 of 116

The low air alarm turns on when air pressure drops below what value?

  1. 30 PSI
  2. 90 PSI
  3. 120 PSI
  4. 60 PSI
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Correct answer: 60 PSI

The low air alarm is set to turn on below 60 PSI (414 kPa).

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 4: Service circuits, page 48

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Questions last reviewed: 18 October 2026