The Audi S4 ABS Sensor provides real time wheel speed data that allows the high performance brake system to react immediately, keeping drivers confidently in control when hard braking is necessary. The ABS Sensor located next to a precisely machined toothed ring on each hub generates an electrical pulse with each tooth that passes by. The control unit reads this electrical pulse in milliseconds. The module examines the pulse rates of all four wheels. If the module observes that one of the wheels is slowing down by a disproportional rate, it quickly relieves pressure to that caliper. The relieving of the caliper pressure prevents lockup while providing the sedan with a brake feel that is responsive and natural. This smooth regulation functions on dry asphalt, wet rain, or loose gravel, indicating long-term durability and fueling the world-famous reliability associated with Audi performance components. During the current sedan, Avant, and Cabriolet generations, as well as earlier versions again wearing the S4 badge, signal logic and mounting points in the brake setup are all identical. The classic turbo inline five, twin-turbo V6, powerful V8, and today's supercharged three-liter V6 all rely on constant communication with the Audi quattro drivetrain via the ABS Sensor to optimize traction and reduce stopping distances for greater efficiency. Two construction types exist, a Hall effect sensor with an embedded magnet and an inductive coil configuration, yet both continuously provide accurate information so that stability electronics can function fully. Should communications fail, a warning light will appear on the dashboard and the ABS function will not work, although standard hydraulics will continue to operate. That shows inherent redundancy, illustrating the brand's design emphasis on safety. Enthusiasts commend Audi for incorporating such clever electronics into the lively S4 and staying on track has made Audi an innovator in the ever-crowded luxury performance marketplace, and that makes the ABS Sensor unique.
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