Is it normal for brake discs to rust?
3 Answers
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.
This is quite common, don't worry. Brake disc rust is mostly normal, especially after parking overnight in rainy or humid weather. Since brake discs are made of iron, they develop rust spots when exposed to moisture in the air, just like an iron wok at home. Just drive for about ten minutes and apply the brakes a few times, and the rust will be worn off, making them shine like new. The key is to observe the degree of rust – if it's too severe, like a thick layer or if there's squeaking when braking, it might indicate worn brake pads or corroded discs, which would require inspection and repair. Try to avoid parking in water when possible to reduce the chance of rusting. Safety-wise, there's no problem.
As someone who frequently deals with vehicles, I've noticed that brake disc rust is a common occurrence and nothing to worry too much about. The principle is simple: brake discs are made of cast iron, a material that naturally tends to combine with oxygen and moisture to form rust. However, this was taken into account during the design phase, and a few applications of the brakes while driving will automatically remove the surface rust. On the other hand, prolonged rust accumulation could corrode the disc surface and affect braking efficiency. It's advisable to check the thickness of the rust layer after each rain or prolonged parking. If the surface feels rough or there's unusual vibration, it's best to visit a shop for a thorough cleaning. Remember, a little attention before driving can save a lot of trouble later on.
