Anti-lock brake system is an electronically controlled system used for maintaining the steerability, direction stability, and the optimum slowing down of the vehicle on different types of roads when severe braking is done by ensuring that the brakes do not lock the wheels through actuating the brake line pressure. It consists of three main components: The WSS includes the wheel speed sensors, the anti-lock brake control module and hydraulic control unit; the latter is sited in different positions of the auto-mobile depending on the model year. It is based on wheel speed sensor that passes variable voltage signals to the control unit which decides about the pressure required for stopping the wheel from locking up and then promptly informs the hydraulic unit. In the case of a complication of the anti-lock system, the warning light for ABS will turn on in the main panel of your car, and it is advised to visually inspect the wiring harness leading to ABS for damages at and near every wheel. In case the warning light is on when operating the car, preliminary actions that can be taken they include checking the brake fluid levels, confirming that all the electrical connections are tight, and checking the fuses before consulting a mechanic. In the procedure of wheel speed sensor pullout, the vehicle should be lifted and well secured, the ignition should be off, the wiring followed and then unhooked before pulling the sensor. The process of installation is vice versa where every part is made sure to have been well fixed.