Air Brake Coach
InspectionQuestion 81 of 116

How much extra air loss is allowed for each trailer in the leak check?

  1. 2 PSI (14 kPa)
  2. 4 PSI
  3. 6 PSI
  4. 10 PSI
Show answer

Correct answer: 2 PSI (14 kPa)

The power unit may lose 4 PSI. Add 2 PSI (14 kPa) for each trailer.

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

Practice inspection

Questions last reviewed: 18 October 2026