Air Brake Coach
TrailersQuestion 33 of 116

Which side of a glad hand seal goes into the coupler?

  1. The thick side
  2. The thin side
  3. Either side
  4. The flat side with the label
Show answer

Correct answer: The thick side

Put the thick side of the seal into the glad hand coupler.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 6: Tractor and trailer circuits, page 60

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Questions last reviewed: 18 October 2026