There are many reasons for brake disc wear, such as defects in manufacturing technology and process of brake pads, uneven mixing of materials, excessive hardness of brake pads or large metal particles. There is also a foreign body between the brake disc and the brake pad, which just causes grooves when the vehicle brakes. In addition, the uneven strength of the brake cylinder will also cause the appearance of grooves.
The wear grooves of the brake disc are not necessarily grooves, sometimes only the front brake disc or the rear brake disc appear wear grooves, which are usually caused by the driver's driving habits and uneven distribution of braking force before and after. Another situation is that only one brake disc is worn out of the groove, and the other brake discs are normal, which is caused by materials or external forces.
In a word, braking is very important for cars. If there is a problem with the brakes, the safety of the vehicle will be threatened. Pay more attention to the grooves on the brake disc.