Air Brake Coach
System partsQuestion 6 of 116

Which tank is the first tank to receive air from the air dryer?

  1. The supply tank
  2. The secondary tank
  3. The trailer tank
  4. The park tank
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Correct answer: The supply tank

Supply, wet and purge are names for the first tank that receives the flow of air.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 3: Supply circuit, page 42

Practice system parts

Questions last reviewed: 18 October 2026