Air Brake Coach
Brake adjustmentQuestion 59 of 116

At what free stroke must you adjust a manual slack adjuster again?

  1. 3/4 inch (19 mm)
  2. 1/8 inch
  3. 1/2 inch
  4. 1 1/2 inches
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Correct answer: 3/4 inch (19 mm)

The guideline to adjust again is 3/4 inch (19 mm) of free stroke.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 8: Foundation brakes, page 79

Practice brake adjustment

Questions last reviewed: 18 October 2026