Air Brake Coach
InspectionQuestion 74 of 116

At what pressure range must the park control valve (yellow button) pop out during the pre-trip?

  1. 50 to 60 PSI
  2. 20 to 45 PSI
  3. 70 to 90 PSI
  4. 100 to 120 PSI
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Correct answer: 20 to 45 PSI

The form says the yellow button must pop out at 20 to 45 PSI (138 to 311 kPa).

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

Practice inspection

Questions last reviewed: 18 October 2026