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What happens if the air pressure in a system's air tanks falls below 60 psi?

A A warning light will come on
In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.
B The vehicle will not shift out of gear
C The front lights will flash
D The vehicle should stop