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A low air pressure warning signal should activate

A When tank pressure falls below 60 psi
Explaination
In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.
B When tank pressure falls below 120 psi
C When tank pressure falls below 10 psi
D When tank pressure falls below 5 psi