Air Brake Coach
Spring brakesQuestion 26 of 116

Which tank supplies air to the park circuit?

  1. Only the primary tank
  2. The tank with the higher pressure, primary or secondary
  3. Only the secondary tank
  4. Only the supply tank
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Correct answer: The tank with the higher pressure, primary or secondary

The park circuit takes air from the higher of the two tanks. The park brakes stay released if one service circuit fails.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 5: Park circuit, page 59

Practice spring brakes

Questions last reviewed: 18 October 2026