Is it normal for brake discs to rust?

[OEvelyn]

It is normal for car brake discs to rust. Here is a detailed introduction about it: 1. Slight rust: Slight rust often occurs, such as after the car is exposed to rain overnight or when the car is not dried after washing. At this time, you can remove the rust by continuously applying the brakes while driving, because the brake disc rubs against the brake caliper during braking, and the rust will be worn off after multiple braking actions. 2. Severe rust: If the brake disc has severe rust, the entire surface of the brake disc has formed a relatively thick layer of rust. Stubborn rust can also accelerate the wear of the brake pads, so it is necessary to take the car to a repair shop to have the brake disc polished.