Your vehicle's brake system is usually made up of the brake rotors, brake caliper, brake drums, and brake pads. These vital brake parts are working together to transmit force to the wheels. Each of them is exposed to certain intensity of heat and pressure. Concurrent to the effect of friction to the tires and the road surface, the brake lights automatically light up to assist road communication. It is the brake pad sensor that does the task of lighting up the brake light. The brake pad sensor, which is a U-shaped copper clip, must always be capable of turning the brake lights on. Light is emitted when the sensor goes down to the embedded wire of the brake pads. As an additional task, the sensors also count the rotation of the wheels for the precise timing of brake warning. Without a quality brake pad sensor in the brake system, your driving will not be safe. Drivers behind you may get confused since you didn't warn them that you are going to decelerate or to suddenly stop. When damaged, a replacement Mercury Brake Pad Sensor should be considered at once. Some vehicles have brake lights at the four corners of their ride; however, they are often mounted at the rear end of your vehicle. These lights often sit side by side with the other auto lights included in the tail light system. Brake light problems often occur due to misconnection of wires and wrong installation. But most of the times, it is the brake pad sensor that is troubled. When installing a replacement Mercury Brake Pad Sensor, always ensure that they are well mounted in their place. This new sensor should also match the specifications of your brake system. Here in our store, you can find a wide selection of brake pad sensors for most applications. Have a quick search through our parts catalog or call us toll free if ever you run into some search troubles.