General Knowledge · Antilock Braking Systems
What does federal regulation require of trailers manufactured on or after March 1, 1998, regarding antilock brakes?
1.They must each be equipped with an ABS malfunction indicator lampCorrect answer
2.They are exempt from every ABS-related requirement in the rules
3.The malfunction lamp is required only on the towing tractor, never the trailer
4.The requirement applies only to trailers that were manufactured after 2010
Explanation
Trailers manufactured on or after March 1, 1998 must be equipped with an ABS malfunction indicator lamp under 49 CFR 393.55(e), so a driver or inspector can see if the trailer's ABS has a fault. The wrong options each get the trailer's status backward: trailers are not exempt, the lamp requirement is not limited to the tractor, and the date given in one option is not the one the regulation actually uses.
Source: 49 CFR 393.55(e)
Related Antilock Braking Systems questions
- Under federal regulation, which of these vehicles must have antilock brakes (ABS) installed?
- What does antilock braking system (ABS) actually do for a driver?
- How should a driver apply the brakes on a vehicle equipped with ABS?
- If a vehicle's ABS malfunction lamp stays on after starting the engine, what should the driver do?