Air Brake Coach
System partsQuestion 4 of 116

The governor cuts in. How far below cut-out pressure must the cut-in pressure be?

  1. 5 to 10 PSI below
  2. 20 to 25 PSI below
  3. 40 to 50 PSI below
  4. 60 to 70 PSI below
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Correct answer: 20 to 25 PSI below

The cut-in pressure must be 20 to 25 PSI (138 to 172 kPa) less than the cut-out pressure.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Air Brake Practical Test (DPLS0003): Supply circuit, page 123

Practice system parts

Questions last reviewed: 18 October 2026