CDL General Knowledge TestDriving SafelyMedium
A commercial driver notices that their vehicle's ABS malfunction light remains illuminated after the initial system check. What does this indicate, and what should be the driver's course of action?
- AThe ABS system is functioning normally; the light will turn off after driving a short distance.
- BThe entire braking system has failed, and the vehicle should not be driven under any circumstances.
- CThe ABS system has a malfunction, but the regular brakes are still operational. Drive carefully to a repair facility.
- DThe ABS system is temporarily disabled due to moisture, and it will reactivate once the vehicle dries out.
Show answer & explanationAnswer & explanation
Correct answer: C. The ABS system has a malfunction, but the regular brakes are still operational. Drive carefully to a repair facility.
An illuminated ABS malfunction light indicates that the Anti-lock Braking System is not working correctly. However, the regular braking system (service brakes) should still be fully functional. The vehicle is safe to drive with caution to a repair facility to address the ABS issue.
Why the other options are wrong
- A. An illuminated malfunction light indicates a fault, not normal operation.
- B. ABS failure does not mean the entire braking system has failed; only the anti-lock feature is compromised.
- D. ABS malfunctions are typically electrical or mechanical, not usually temporary due to moisture.
ABS Malfunction Light
An indicator light on the dashboard that illuminates when the Anti-lock Braking System (ABS) detects a fault, signaling that the ABS feature is not operational.
- Indicates ABS failure, not total brake failure.
- Regular brakes (service brakes) still function.
- Requires inspection and repair, but vehicle can be driven cautiously.
Memory trick: ABS light on, regular brakes still strong!