What Causes Deep Scratches on Brake Discs?

[Gary]

Deep scratches on brake discs are caused by friction between the brake pads and the discs. If the scratches are evenly distributed and relatively shallow, this is considered normal. Brake discs, also known as rotors, are metal discs fixed to the wheels and rotate with them, typically made of alloy steel. Below are the functions of the braking system: 1. Service Braking: During driving, the service brake (foot brake) is commonly used to slow down the vehicle or bring it to a stop within the shortest distance possible; it also helps maintain stable speed when driving downhill. 2. Parking Brake: The parking brake not only keeps the vehicle stationary but can also be used if the service brake fails. Once the vehicle is parked, the parking brake (handbrake) should be engaged to prevent the vehicle from rolling forward or backward.