The ABS system in a Ford truck senses the wheel speed and prevents the wheels from locking up. This system is very advanced and can apply brake pressure intermittently--also called "pumping the brakes--much quicker than any human being could ever do. While a total ABS system failure is extremely rare, it can happen. If it does happen, you'll need to know how to troubleshoot the problem so that you can have it fixed.
Remove the fuse-box panel under the dash and locate the fuse running to the ABS system.
Remove the fuse and check to see if it is popped. If the fuse has failed, you'll need to replace it with a fuse of the same amperage.
Turn the steering wheel all the way to the right.
Check ABS sensor behind the wheel. The ABS sensor is mounted to the wheel bearing and hub assembly and will have wires running off the sensor. It will be the only sensor attached to the wheel hub. Make sure there are no frayed or damaged wires. Repeat this process for each wheel.
Turn the ignition key to the "II" position. If the ABS sensor light comes on and stays lit, the ABS system has failed or is malfunctioning and needs to be checked by a professional mechanic.
