Will the Brake Discs of a New Car Rust?
2 Answers
Brake discs can rust, which is not a quality issue with the car, nor does it indicate that the car has been in stock for a long time. This is a normal phenomenon. Since brake discs are primarily made of iron and lack any anti-rust treatment, they will rust when exposed to moisture in the air. Solution for Slight Rust: If the brake discs have slight rust, it can usually be removed through normal braking. The principle is that the friction between the brake pads and the brake discs will wear away the rust. After braking a few times, the brake discs will shine like new. If there are areas the brake pads don't reach, you can remove the wheel and use fine sandpaper to polish the brake disc. Solution for Heavy Rust: If the corrosion is severe, relying on the braking system to remove the rust may not be effective, especially if the car has been left idle for an extended period, making the rust more stubborn. In such cases, the car should be taken to a specialized repair shop for professional servicing by a technician. If the rust is extremely severe, the brake discs may need to be removed and professionally polished or resurfaced.
I just bought a new car and noticed a thin layer of rust on the brake discs when picking it up. I was worried it might be a quality issue. Later, I learned from a friend that brake discs are usually made of cast iron, which easily oxidizes and rusts in humid environments. This is a normal phenomenon that all cars experience. Just driving around and applying the brakes a few times will wear off the rust without affecting safety. Now, every time after rain, the brake discs still show slight rust, but they return to normal after use, so there's no need to worry.
