How to Troubleshoot Big Truck ABS Lights


The anti-lock braking system (ABS) in a big truck is very similar to those in most vehicles. A sensor at each wheel monitors wheel speed. During hard braking, the wheel sensor controls the braking action to prevent wheel lockup. If the sensor determines that the wheel has locked up, it automatically pumps the brakes to prevent a skid. Over time, these sensors may malfunction, but they rarely fail. However, to be sure, you should troubleshoot the system.

  • Check the fuse for the traction control and ABS by first removing the fuse box panel under the steering wheel.

  • Pull the fuse for the ABS with the fuse puller located in the fuse panel.

  • Check that the metal strip inside the fuse is not damaged. If necessary, replace the fuse with another one of the same amperage.

  • Check the ABS sensors at the wheels. Behind the wheels, on the brake rotor assembly, there will be two wires running to the back of the brake rotor. These are the ABS sensor wires. If the ABS system is damaged, the problem is usually found in the wiring. Make sure that none of the wires is damaged.

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  • "Motor Heavy Truck Repair Manual"; Motor Publications, Edmonds; 2008
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