Air Brake Coach
System partsQuestion 2 of 116

How long can the compressor take to build air from 50 to 90 PSI with the engine at 1200 RPM?

  1. 10 minutes
  2. 30 seconds
  3. 6 minutes
  4. 3 minutes
Show answer

Correct answer: 3 minutes

The manual gives 3 minutes as a generous time. Most vehicles do it in 1 to 1.5 minutes.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 3: Supply circuit, page 39

Practice system parts

Questions last reviewed: 18 October 2026