Ontario Class D Practice Test · Question
Spring (parking) brakes will automatically apply as system air pressure falls to about:
Spring brakes automatically set as pressure drops to roughly 20–45 psi, stopping the vehicle.
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Question: Spring (parking) brakes will automatically apply as system air pressure falls to about:
Answer options: ✅ 20–45 psi
- 60–70 psi
- 80 psi
- 100 psi
Correct answer: 20–45 psi
Explanation: Spring brakes automatically set as pressure drops to roughly 20–45 psi, stopping the vehicle.
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Question explanations
- When performing a pre-trip inspection, what is the minimum air pressure required in an air brake system before
- When driving a straight truck, how should you pass a pedestrian walking on the shoulder of the road without a
- Scenario 1: Tare weight refers to:
- Scenario 2: Gross combination weight (GCW) is:
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