* Front Wheels: The sensors are usually located within the wheel bearing assembly on the front wheels. You'll likely need to remove the wheel to access them. They're generally a small, cylindrical unit with a wire coming out of it.
* Rear Wheels: The location on the rear wheels can vary slightly depending on whether your truck has disc or drum brakes. If it has disc brakes, the sensors will be similar in location to the front (in the wheel bearing assembly). If it has drum brakes, they will be positioned within the backing plate near the axle. Again, wheel removal will be necessary for access.
Finding them will require you to:
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your year and model truck will show diagrams and precise locations. This is the best way to be certain.
2. Look closely at the wheel hubs and backing plates: Once you have the wheel removed, carefully inspect the area around the wheel bearings for the sensors. They're relatively easy to spot once you know what to look for.
Remember to disconnect the battery's negative terminal before working on any ABS system components to prevent accidental shorts. If you're not comfortable working on your vehicle's braking system, it's best to take it to a qualified mechanic.
