The brake pad sensor in your Audi reacts when the front brakes wear down to about 25% left on the pads. It is triggered by an insert in the pads that has two wires closed. The wiring and pad is part of a ground loop that starts at the instrument cluster, goes through both brake pads and to ground. Once this path is broken, the brake pad sensor squeals and usually emits a warning light. The squealing or squeaking sound is produced by your brake pads sensors. This device is made to determine whether the brake pad lining is nearing its minimum capacity of generating friction needed to stop your vehicle. Apart from that they serve as warning signs for car users that their brake pads which is one of the most important parts in the brake assembly is neither in bad condition or is having troubles. If suddenly your trusted brake pad sensor has gone fading and deactivated, you and your car could be facing a big trouble. The brake assembly is located deep in your car's floor panel so, it's impossible to keep an eye on them all the time and anticipate for any trouble it may give you while on the road. The sensor is a great and convenient way of knowing your brake pad's condition. In connection to this, any damaged brake pad sensor is risky. Change your old and defective brake pad sensor with a new Audi brake pad sensor replacement part before it may cause you further damages. Also if you are going to install a new sensor be sure to check the condition of your brake components too. Our company website offers a complete variety of replacement products for different vehicles. We also offer Audi replacement products in discount prices and standard quality. You just have to check them out by visiting our store online anytime of the day.