Trailer ABS warning lights can be a common frustration for truck drivers. There are a few simple troubleshooting steps that can often resolve the issue. One common fix is to unplug the ABS light pigtail and reconnect it. Another trick is to apply WD40 to both the pigtail and socket and then use a bungee cord to secure a tight connection. Often, simply driving a few hundred miles can resolve the problem as vibration can dislodge brake dust that may be interfering with the sensor.
One possible cause of frequent ABS issues is improper brake usage. Overuse of trolley brakes while descending hills can overheat and damage trailer brakes, leading to excessive brake dust and heat buildup around the sensors. This can trigger ABS warning lights. In some fleets, this problem can be prevalent, with as many as 1 in 25 trailers exhibiting this issue.
Sometimes, even professional repairs don’t immediately solve the problem. One instance involved a trailer with a persistent ABS light despite replacing the ground wiring, brake drums, and linings. Even after thorough electrical checks, the light remained on. The issue eventually resolved itself after driving about 100 miles. This highlights the intermittent nature of some ABS problems and the potential for simple solutions like driving for a short distance to clear up minor sensor obstructions. While there’s no guaranteed fix for every situation, these simple troubleshooting steps can often resolve common ABS issues on trailers.
