Air Brake Coach
Brake adjustmentQuestion 54 of 116

What causes almost all runaways?

  1. Failures in the foundation brakes
  2. Failures in the air system
  3. A weak compressor
  4. A dry air dryer
Show answer

Correct answer: Failures in the foundation brakes

Almost all runaways come from foundation brake failures, not from the air system.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 8: Foundation brakes, page 75

Practice brake adjustment

Questions last reviewed: 18 October 2026