If the low air pressure warning device itself seems to be malfunctioning, such as never activating even when you fan the brakes with the engine off, what should you conclude?
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Correct answer to question 61 (Air Brakes): The vehicle has a real problem that needs to be found and fixed before the vehicle is driven, since you cannot confirm the warning would protect you
Why
If the warning never activates even during a deliberate test, you have no way to know it would warn you during a real pressure drop, so the vehicle needs repair before it goes back into service.
Updated: November 2026