What should happen when you start the bus regarding the ABS indicator on the dashboard?

• A. The ABS indicator should stay illuminated during the entire start-up
• B. The ABS indicator should illuminate and then turn off promptly
• C. The ABS indicator should blink continuously
• D. The ABS indicator should not illuminate at all

Answer: (B)

When starting the bus, the ABS (Anti-lock Braking System) indicator should illuminate briefly during the system self-check and then turn off if the ABS is functioning correctly. This behavior indicates that the system is testing itself, ensuring that all components are operational. If the indicator lights up and then goes off, it confirms that the ABS is in good working order, allowing the driver to operate the bus with confidence that braking systems are functioning as intended.

If the ABS indicator remains on after the initial startup, it typically signifies a problem with the ABS that requires attention. This condition could mean that the system has detected a malfunction, which could lead to reduced braking performance. Having the indicator blink continuously would suggest a fault as well and may require servicing. Lastly, if the indicator does not illuminate at all during startup, it could either indicate a failure of the indicator light itself or a more serious issue where the ABS system is not functioning. Thus, the correct procedure is for the ABS indicator to light up momentarily and then go out, confirming system readiness.