Audible Alerts
An audible alert sounds during the ignition sequence until the self-test is completed, and whenever one of the following conditions exists:
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Air pressure falls below 65 psi (448 kPa).
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Anytime the low air warning lamp is activated. During start-up until air pressure in the tanks reaches approximately 70 to 76 psi (483 to 524 kPa).
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When the parking brake is engaged. The parking brake will not disengage until the air pressure has reached 65 psi (448 kPa).
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Emergency engine shutdown is activated.
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The parking brake is applied and the transmission is not in neutral.
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The transmission is in neutral or the ignition is in the OFF position, and the parking brake is not set and the service brake is not depressed.
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Anytime the ignition is turned OFF and the panel lamps are still illuminated.