Air Brake Coach
Brake adjustmentQuestion 71 of 116

Why do spring park brake applications not adjust automatic slack adjusters?

  1. The park brakes use no push rod
  2. The park brakes use more air
  3. The spring is too weak to move
  4. A park application is only about half of a full service application
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Correct answer: A park application is only about half of a full service application

A park application is about half of a full service application. It does not trigger the adjustment.

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

Practice brake adjustment

Questions last reviewed: 18 October 2026