Air Brake Coach
TrailersQuestion 31 of 116

Which side of the trailer does the service coupler traditionally connect to?

  1. The driver side
  2. The passenger side
  3. The rear
  4. The side with the landing legs
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Correct answer: The passenger side

The service coupler traditionally connects to the passenger side of the two trailer couplers.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 6: Tractor and trailer circuits, page 65

Practice trailers

Questions last reviewed: 18 October 2026