audi a4 brake calipers Available Here. Your vehicle’s disk brake system has some vital components that allow it to slow and stop at a moment’s notice. Brake calipers are important because they create friction with the rotors, causing the wheels to slow. How does this work exactly? When you press down on the brake pedal, fluid moves from the master cylinder to these brake calipers. The fluid puts pressure on the pistons inside the calipers, causing the brake pads to push against the rotors and cause your car to come to a stop. Here at MicksGarage.com we carry over 50,000 brake calipers from top brands in the industry. Simply enter your car’s make and model and get started searching for the part that’s right for your vehicle!