Air Brake Coach
TrailersQuestion 32 of 116

What happens if a glad hand seal is soft or worn?

  1. The coupler will leak
  2. The brakes will lock
  3. The governor will cut in
  4. The air will get drier
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Correct answer: The coupler will leak

Soft or worn seals leak. Check the glad hands before you connect them.

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

Practice trailers

Questions last reviewed: 18 October 2026