Mechanic Tests - Air ABS Systems

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1) All of the following could cause a failure in an air ABS system except:
2) The warning light on a truck with anti-lock brakes comes on when the truck key is turned on, the truck started and stays on when the truck is moving. Which of the following could be the cause?
3) What happens if an ABS system component ceases to function?
4) Some ABS systems may use two micro processors. In these systems, both must agree on diagnosis and commands or the system will go into "failsafe" mode.
5) Technician A says some ABS systems use a series of light emitting diodes (LED's) on a panel to indicate faults. Technician B says that the signal from the wheel sensors produce an A/C signal that is proportional to wheel speed. Who is correct?