How do brake disc scratches occur? How to fix it?

       Scratches on brake discs are a common issue in the use of automobiles, which not only affect aesthetics but may also impact braking performance and driving safety. Understanding the causes and repair methods of brake disc scratches is crucial for ensuring the normal operation of the brake system.
       1、 Reasons for Scratches on Brake Discs
       Uneven wear of brake pads:
       Uneven wear of brake pads can result in uneven contact with the brake disc, and long-term use may cause scratches on the surface of the brake disc.
       Hard or poor quality brake pad materials can also increase the risk of scratches.
       Foreign objects entering:
       During driving, foreign objects such as sand and small stones may enter between the brake disc and brake pads, causing scratches during braking.
       Metal fragments or hard objects on the road surface may also scratch the surface of the brake disc.
       Thermal expansion and contraction:
       When the brake disc encounters cold water and rapidly cools after high temperature, thermal expansion and contraction can cause micro cracks on the surface of the brake disc, which may further expand into scratches.
       Brake disc material issue:
       Low quality brake discs may be more prone to scratches due to insufficient material hardness or low machining accuracy.
       Driving habits:
       Frequent sudden braking or frequent use of brakes in mountainous areas can increase the risk of brake disc wear and scratches.
       2、 Repair methods for brake disc scratches
       1. Repair of minor scratches
       Polishing treatment:
       For minor scratches, sandpaper can be used for polishing treatment. Choose a suitable sandpaper (such as 800 or 1000 grit) and gently polish the scratched area to make the surface smooth.
       After polishing, use a clean cloth to wipe the surface of the brake disc and remove the dust generated by polishing.
       Lubrication treatment:
       Apply an appropriate amount of brake lubricant on the polished surface of the brake disc to reduce friction and noise, while protecting the surface of the brake disc.
       2. Repair of moderate scratches
       Disc processing:
       For moderate scratches, disc treatment can be considered. Disc refers to the process of cutting the surface of a brake disc using a lathe to restore its flatness.
       Disc processing requires professional equipment and technology, and it is recommended to go to a professional repair shop for operation.
       Check the brake pads:
       At the same time, check the wear of the brake pads and replace them with new ones if necessary to avoid scratches from appearing again.

       3. Repair of severe scratches
       Replace the brake disc:
       If the scratches are very severe and cause uneven or cracked brake disc surfaces, it may be necessary to replace the brake disc with a new one.
       When replacing brake discs, it is recommended to choose high-quality products to ensure braking performance and service life.
       Professional maintenance:
       The repair of severe scratches requires professional skills and equipment. It is recommended to send the vehicle to a professional repair shop for inspection and replacement.
       3、 Methods to prevent scratches on brake discs
       Regularly check the brake system:
       Check the wear of brake discs and brake pads every 10000-20000 kilometers, and promptly identify and address any issues.
       Keep the brake system clean:
       Regularly clean the dust and dirt on the brake discs and brake pads to prevent foreign objects from entering.
       Choose high-quality brake pads:
       Choose high-quality brake pads that match the vehicle to reduce the occurrence of scratches.
       Avoid sudden braking:
       Try to avoid frequent sudden braking to reduce the risk of brake disc wear and scratches.
       Avoid thermal expansion and contraction:
       Avoid immediately rinsing the brake disc with cold water when it is hot, to reduce the impact of thermal expansion and contraction on the brake disc.
       There are various reasons for brake disc scratches, including uneven wear of brake pads, foreign objects entering, thermal expansion and contraction, material issues, and driving habits. Minor scratches can be repaired by polishing, moderate scratches require disc treatment, and severe scratches may require replacement of the brake disc. By regularly inspecting, maintaining cleanliness, selecting high-quality brake pads, and avoiding sudden braking, the occurrence of brake disc scratches can be effectively prevented, ensuring the normal operation of the brake system and driving safety.