CDL Combination Vehicles TestInspecting Combination VehiclesMedium
During an en route inspection, you notice that the trailer's ABS malfunction lamp is illuminated. All other lights and brakes appear to be functioning normally. What does this indicate, and what is your best course of action?
- AThe trailer's ABS system has a fault; continue with caution, as you still have regular braking, and report for repair.
- BThe trailer's service brakes are about to fail; pull over immediately and call for assistance.
- CThe tractor's ABS system is faulty, affecting the trailer; check tractor's ABS light.
- DThe trailer's electrical system has a general fault; continue to destination and report the issue.
Show answer & explanationAnswer & explanation
Correct answer: A. The trailer's ABS system has a fault; continue with caution, as you still have regular braking, and report for repair.
An illuminated ABS malfunction lamp on the trailer indicates a fault within the trailer's Anti-lock Braking System. While regular brakes should still function, the ABS feature (preventing wheel lock-up) will not. It's crucial to continue with caution and report it for repair, as ABS is a safety feature.
Why the other options are wrong
- B. An ABS fault does not typically mean immediate service brake failure, but rather a loss of ABS functionality.
- C. The trailer's ABS lamp specifically indicates a fault in the trailer's system, not necessarily the tractor's.
- D. If it were a general electrical fault, other lights would likely be affected.
Trailer ABS Malfunction
The Anti-lock Braking System (ABS) prevents wheels from locking up during hard braking. An illuminated ABS lamp signals a fault in the system, meaning ABS functionality is lost, but conventional braking usually remains.
- ABS prevents wheel lock-up.
- Illuminated lamp means ABS is not working.
- Regular braking still functional.
- Requires repair, but not immediate roadside stop unless other brake issues arise.
Memory trick: ABS light on? You still have brakes, but no ABS grace.