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What Causes the Squeaking Noise When Starting with Rusty Brake Discs?

2 Answers

DeVivian

07/29/25 4:54am

Here are the reasons for squeaking noises with rusty brake discs: 1. Slight rust on the brake disc surface: It can be removed by continuous braking while driving, and no special treatment is needed because minor rust on the brake discs will be worn off during braking while driving. If the rust is more severe, it may cause vibrations or shaking during braking, such as brake pad vibrations, steering wheel vibrations or shaking, or body vibrations. Of course, this should be done under safe conditions without affecting public traffic. While driving, lightly apply the brakes to let the friction between the brake pads and the brake discs "polish" the surface. 2. Severe rust on the brake discs: When there is significant rust, it can cause unevenness on the brake disc surface, leading to noticeable vibrations in the brake pedal, steering wheel, and body during braking. In such cases, it becomes difficult to remove the rust completely, and even if "polished," it may result in abnormal wear of the brake pads and continued vibrations. Therefore, it is recommended to perform maintenance on the brake discs every two months to prevent severe rust buildup.

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VonLane

08/12/25 8:33am

I've encountered this situation while driving too. Brake disc rust mainly occurs due to moisture residue after rainy days or car washing, where the metal surface oxidizes and forms rust in humid weather. When you first start moving, the rotation of the wheels causes the brake pads to rub against the disc surface and remove the rust, which can produce a squeaking sound. This is usually normal, and the sound disappears after driving a few hundred meters. However, if the noise persists every time you start after parking, you should suspect whether the brake pads have worn thin and need replacement. When parking, try to choose dry locations whenever possible, or after washing the car, don't stop immediately—drive a few more laps to evaporate the moisture. In short, don't worry about minor rust, but if it happens repeatedly, carefully inspect the brake system.

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