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Is it normal for brake discs to rust after a car has been parked for a long time?

1 Answers

SanBradley

07/29/25 3:30pm

It is normal for brake discs to develop a ring of rust when the car is parked in a place with high humidity for an extended period. Below is some relevant information about brake pads: 1. Classification of brake pads: Asbestos brake pads (mostly phased out), semi-metallic brake pads, low-metallic brake pads, NAO formula brake pads, ceramic brake pads, NAO ceramic brake pads. 2. Ceramic brake pads vs. traditional brake pads: In traditional brake pads, metal is the main material that generates friction, providing strong braking force but with high wear and a tendency to produce noise. After installing ceramic brake pads, abnormal squealing (clicking sounds) will not occur during normal driving. Since ceramic brake pads do not contain metal components, they avoid the metal screeching noise caused by friction between traditional metal brake pads and their counterparts (i.e., brake pads and brake discs). 3. Stable friction coefficient: Ordinary brake pads have immature friction materials, and a friction coefficient that is too high can lead to unsafe factors such as loss of control during braking, pad burning, and scratching of the brake discs. Even when the brake disc temperature reaches as high as 650 degrees, the friction coefficient of ceramic brake pads remains around 0.45-0.55, ensuring the vehicle maintains good braking performance.

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