Air Brake Coach
TrailersQuestion 38 of 116

What is the problem with air pressure park brakes?

  1. They do not stay on
  2. They are too strong to release
  3. They need no air
  4. They cannot be used on tractors
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Correct answer: They do not stay on

As air drains out of the system, air pressure park brakes release.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 6: Tractor and trailer circuits, page 68

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Questions last reviewed: 18 October 2026