Ontario Air Brake Practice · Question
Scenario 69: Spring (parking) brakes apply automatically when air pressure falls to about:
Spring brakes apply automatically as pressure drops to roughly 20–45 psi, stopping the vehicle. The correct answer is "20–45 psi". This capacity-fill scenario 6
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Question: Scenario 69: Spring (parking) brakes apply automatically when air pressure falls to about:
Answer options: ✅ 20–45 psi
- 55–60 psi
- 85 psi
- 100 psi
Correct answer: 20–45 psi
Explanation: Spring brakes apply automatically as pressure drops to roughly 20–45 psi, stopping the vehicle. The correct answer is "20–45 psi". This capacity-fill scenario 69 reinforces the same competency for the airbrake bank and follows the certified explanation standard.
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