Air Brake Coach
Driving with air brakesQuestion 102 of 116

What can cause a trailer to slide and swing in a combination vehicle?

  1. Uneven load distribution and loss of brake balance
  2. Too much air in the tanks
  3. A new air dryer
  4. A steady ABS light
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Correct answer: Uneven load distribution and loss of brake balance

An empty trailer rear gets the same air pressure as the loaded axles. The rear can slide and swing.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 9: Driving tips, page 92

Practice driving with air brakes

Questions last reviewed: 18 October 2026