Air Brake Coach
System failuresQuestion 52 of 116

How do you know that a trailer air tank has failed?

  1. The ABS light is steady
  2. Both gauges read unusually low
  3. The red button is pushed in
  4. The yellow button is pushed in
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Correct answer: Both gauges read unusually low

A trailer tank failure shows as a very low reading on both pressure gauges.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 7: System failures, page 73

Practice system failures

Questions last reviewed: 18 October 2026