Air Brake (Q Endorsement) Practice · Question
When performing a functional test of the low air pressure warning system, at what approximate pressure should the warning buzzer and light activate when the engine is off and the service brake is applied repeatedly?
The low air pressure warning system (buzzer and light) must activate when the air pressure in the service reservoirs drops below 414 kPa (60 psi). This is a cri
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Question: When performing a functional test of the low air pressure warning system, at what approximate pressure should the warning buzzer and light activate when the engine is off and the service brake is applied repeatedly?
Answer options: ✅ Below 414 kPa (60 psi)
- Below 552 kPa (80 psi)
- Below 689 kPa (100 psi)
- Above 207 kPa (30 psi)
Correct answer: Below 414 kPa (60 psi)
Explanation: The low air pressure warning system (buzzer and light) must activate when the air pressure in the service reservoirs drops below 414 kPa (60 psi). This is a critical threshold to ensure the driver is alerted before brake effectiveness is significantly compromised.
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