Air Brake Coach
Brake adjustmentQuestion 66 of 116

Which way do you turn the wrench to tighten a manual slack adjuster?

  1. Always to the right
  2. Always to the left
  3. Always clockwise
  4. The direction that turns the s-cam shaft the way the brake applies
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Correct answer: The direction that turns the s-cam shaft the way the brake applies

There is no one direction. It depends on how the slack adjuster is installed.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 8: Foundation brakes, page 81

Practice brake adjustment

Questions last reviewed: 18 October 2026