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If the air pressure in an air brake system becomes too low, it may

A Cause the brakes to stop working
Explaination
If the pressure in an air brake system becomes too low, the brakes will no longer work. If the low pressure warning signal activates, you should leave the road and stop safely while you still have braking power. more
B Cause the brakes to lock up
C Cause the brakes to pulsate when used