Air Brake Coach
InspectionQuestion 83 of 116

What air pressure must you have when you make the full service applications to adjust automatic slack adjusters?

  1. About 20 PSI
  2. About 60 PSI
  3. Above 100 PSI
  4. About 40 PSI
Show answer

Correct answer: Above 100 PSI

The air pressure must be in the normal range, above 100 PSI (690 kPa).

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 8: Foundation brakes, page 85

Practice inspection

Questions last reviewed: 18 October 2026