Texas CDL School Bus Complete Practice Test 2025

When confirming that a vehicle is equipped with anti-lock brakes, the presence of a yellow ABS malfunction lamp lighting up when the engine starts is a key indicator. This light serves as a diagnostic tool, signaling the driver that the anti-lock braking system is present and functioning.

As the vehicle starts, the ABS system performs a self-check, which causes the light to illuminate briefly. If the light remains on after the self-check, it could indicate a malfunction in the system, prompting the driver to seek maintenance or investigation. This self-check feature and the corresponding warning light are critical for ensuring that the ABS is operational, crucial for maintaining control during emergency braking situations.

While the other options may seem relevant, they do not specifically confirm the presence of an anti-lock braking system in the same definitive way. The other options relate either to different warning signals or functions not specifically linked to the existence of ABS. Thus, the yellow ABS malfunction lamp provides a clear and direct confirmation that the vehicle is equipped with these important safety features.