Air Brake (Q Endorsement) Practice · Question
If the air pressure warning light and buzzer activate while driving, what is the minimum pressure that triggered them?
The low air pressure warning device (buzzer and light) activates when the primary or secondary reservoir pressure falls below 55 psi (or sometimes up to 75 psi
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Question: If the air pressure warning light and buzzer activate while driving, what is the minimum pressure that triggered them?
Answer options: ✅ Between 55 psi and 75 psi.
- Below 40 psi.
- Between 85 psi and 100 psi.
- Below 20 psi.
Correct answer: Between 55 psi and 75 psi.
Explanation: The low air pressure warning device (buzzer and light) activates when the primary or secondary reservoir pressure falls below 55 psi (or sometimes up to 75 psi depending on the vehicle), indicating a dangerously low air supply.
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