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If the low air pressure warning signal is not working,

A it may lead to sudden emergency braking in a single-circuit air system.
Explaination
The low pressure warning signal should come on before the air pressure falls below 60 psi. If it fails to do so, the air pressure may keep falling without you're knowing it. In a single-circuit air system, your spring (emergency) brakes may come on suddenly. In a dual air system, either the front or the rear brakes won't work properly, the braking distance of your vehicle will increase, and continued braking will soon cause the spring brakes to come on.
B you may lose air pressure, but at least you'll know about it anyway.
C neither of the above will happen.