Air Brake Coach
Spring brakesQuestion 20 of 116

At about what pressure do the park springs begin to expand?

  1. 20 to 25 PSI
  2. 82 to 84 PSI
  3. 45 to 50 PSI
  4. 100 to 110 PSI
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Correct answer: 82 to 84 PSI

The park springs begin to expand at 82 to 84 PSI (566 to 580 kPa).

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 5: Park circuit, page 58

Practice spring brakes

Questions last reviewed: 18 October 2026