Flashcard 17 - Air Brakes Flashcard Set for the CDL

The low pressure warning light illuminates above 60 psi.

There is an electric pressure switch somewhere in the air system. While the pressure is below this switch’s “set point,” the indicator light (and buzzer) will be on. When a truck is first started (before the air system is “pumped up”), it is normal for the light and buzzer to be on until this “set point” is reached. This “set point” is above 60 psi.