Will rusting of brake discs affect braking effectiveness?

       Rust on brake discs is a problem that many car owners may encounter during use, especially after prolonged parking or driving in humid environments. So, will rusting of the brake disc affect the braking effect? The following is a detailed analysis and recommendations.
       1、 Reasons for rusting brake discs
       Rust on brake discs is usually caused by prolonged disuse or parking in damp environments. Most brake discs are made of materials such as gray cast iron, which can easily react chemically with oxygen and moisture in humid air, forming rust.
       2、 The impact of rusted brake discs on braking performance
       Slight rust: Slight rust usually does not have a significant impact on braking performance. During vehicle operation, the friction between brake pads and brake discs can quickly remove surface rust and restore normal friction performance of the brake discs.
       Severe rusting: If the rust is too severe, it may cause the surface of the brake disc to be uneven, affecting the contact between the brake pads and the brake disc, thereby reducing the braking effect, increasing the braking distance, and even causing brake shaking or abnormal noise.

       3、 How to deal with brake disc rust
       Slight rust stains:
       Continuous braking method: On a safe road section, rust is removed by lightly applying the brakes and utilizing the friction between the brake pads and brake discs.
       Kinetic energy recovery mode: For vehicles equipped with kinetic energy recovery systems, such as Xiaomi SU7, in high kinetic energy recovery mode, the vehicle will periodically use hydraulic braking to complete "grinding disc rust removal".
       Severe rust:
       Professional cleaning: If the rust is severe, it is recommended to go to a professional car repair shop for cleaning and polishing to restore the normal friction performance of the brake disc.
       Replacing brake discs: If the rust is very severe, causing severe unevenness or cracks on the surface of the brake disc, a new brake disc may need to be replaced.
       4、 Measures to prevent rusting of brake discs
       Regular use of vehicles: Avoid parking vehicles for long periods of time, especially in damp environments. It is recommended to start the vehicle at regular intervals and lightly apply the brakes to keep the brake discs dry and clean.
       Keep the vehicle dry: When parking in a damp environment, you can choose to use a car cover or moisture-proof pad to protect the brake discs.
       Clean the brake system: Regularly inspect and clean the brake system, especially after driving in a humid environment, and promptly clean the dirt and rust on the brake discs and brake pads.
       Rust on brake discs is a normal phenomenon, and slight rust usually does not affect the braking effect. It can be removed through continuous braking or kinetic energy recovery mode. However, if rust is severe, it may reduce braking effectiveness and even affect driving safety, requiring timely professional cleaning or replacement of brake discs. To prevent brake disc rust, it is recommended to use the vehicle regularly, keep it dry, and clean the brake system regularly.