Is It Normal for Car Brake Discs to Rust?

[Archie]

It is normal for car brake discs to rust. Here is the relevant information: 1. Whether braking is easy mainly depends on the material of the brake disc, as most household cars currently use the gray cast iron 250 standard for brake discs. Although the braking effect is good, the carbon content is relatively high, and the surface lacks anti-rust protection, making rust inevitable. 2. Additionally, brake discs are exposed to the elements, constantly in contact with mud, rainwater, and moisture in the air. If the car is not driven for a few days, the brake discs will start to rust. Even newly replaced brake discs can rust overnight in humid weather. General rusting does not affect braking performance. In fact, simply driving the car and applying the brakes a few times will wear off the rust.