Anti-lock Braking System (ABS) speed sensors magnetically read the rotational speed of each wheel, which is fed back to the vehicle’s electronic control unit (ECU). When a wheel is starting to lock up and/or skid, the ABS system intervenes to gradually release and re-apply the brake many times per second to help ensure maximum braking efficiency and directional control can be maintained.

Without ABS, a wheel will automatically lock up in slippery and/or gravel-like conditions, as well as potentially experience a loss of directional control and vehicle stability.

Kindly note that:

Like anything else, sensors wear out, corrode, or become dirty. This essentially blinds the computer and triggers the terrible check engine light. You can purchase or prepare a code reader and read your OBD codes, that will help you a lot on installation.

Either way, you should always consult a repair manual before attempting any procedure involving automotive sensors. If you’re servicing a vehicle built before 1996, youll need a code reader that reads OBD I information. Post 1996, youll need a code reader capable of OBD II diagnostics.

1) Always wear eye protection and start with installation tools.
2) Searching related installation video on the internet will be recommended.