The Known & Dreaded Brake Squeal
Over the years, people with high performance braking systems, particularly on European cars, complain about brake squeal issues. One major manufacturer with this dilemma is Porsche. But, according to Porsche, brake squealing is rarely a sign of trouble. It is actually quite inevitable. The concern with Porsche brake squeal noise is not restricted to one manufacturer, but any using performance braking systems. Thankfully, Porsche uploaded a video to YouTube in which engineers explain the propensity for squealing. Even with top-of-the-line brakes, the squeal can occur due to corrosion, humidity, and/or temperature. Let’s dive a bit deeper below!
The Physics Behind Brake Squealing
As mentioned above, Porsche brake squeal is not limited to one manufacturer, but many. Companies including Audi, BMW, and Mercedes-Benz have come across this dilemma as well. Brake squeals occur when the energy of motion converts to hear in minute vibrations. From there, the heat dissipates via the braking system. This generates the beautiful nose of brake squealing.
In this event, the rotor basically acts as a speaker for the microscopic vibrations, known as stick slip. With large rotors and pads, the pad pressure distributes differently, leading to squeals at low speed. To put it simply, every material in existence is subject to vibration when acted on by a force. This creates what is commonly known as coupled frequencies. Although manufacturers test materials for friction and vibration, the squeal is typically unavoidable. But, the focus is on minimization, which Porsche is constantly working towards.
Brake Squeal is Typical for HP Brakes
Unfortunately, brake squeal is typical for any high-performance brakes. Porsche brake squeal is no different, with considerably the crème of the crop braking systems. People buying sports cars want high horsepower and torque, but that comes with the price of the squeal. Is the squeal worth it? Yes. Is it annoying? Yes. Porsche actually adds masses to the braking system in attempt to minimize squeal. Furthermore, these systems have 4 times the stopping power necessary for the strongest Porsche motors. In conclusion, the brake squeal issue is known and manufacturers will continuously work to minimize it moving forward.