What Causes Brake Disc Noise in Cars?

[DianaLynn]

The causes of brake disc noise in cars are: 1. Noise caused by brake disc deformation: When the thickness of the brake disc changes in the circumferential direction, the brake disc needs to be repaired and ground; 2. Severe brake disc wear: Severe wear on the brake disc can form deep grooves on the disc, and friction between the brake disc and the edges of the grooves can cause noise. If the grooves are not deep, grinding the edges of the brake pads may suffice. If the grooves are very deep, replacement is necessary; 3. Foreign objects between the brake pads and brake disc: Small stones or water films can cause noise, which usually disappears after driving for a while. Alternatively, the foreign objects can be removed manually; 4. Missing or damaged fixing screws of the brake disc can also cause brake noise; 5. New cars during the break-in period or after replacing brake pads may produce some noise, which is normal and will disappear after the break-in period.

[OMakayla]

I've experienced squeaky brake discs while driving, and the noise was really piercing. Common causes include brake pads worn too thin, exposing the metal layer that grinds against the disc; rust or scratches on the disc surface, especially more frequent during humid rainy seasons; and insufficient lubrication of the caliper sliders, causing dragging. Lightly applying the brakes a few times can sometimes remove the rust, but if the noise persists, it's time to check the thickness. Brake pads thinner than 3mm should be replaced, as continued use dangerously reduces braking efficiency. Noises on highways increase reaction time—safety isn't something to take lightly. I've made it a habit to inspect my braking system every six months, including cleaning components and applying lubricant. Remember, addressing squeaks promptly can avoid costlier repairs; delaying might damage the entire brake system.

[LaKendra]

I enjoy DIY car repairs, and when it comes to brake disc noise, I usually troubleshoot it myself. First, I check the brake pad thickness—if it's too thin, I replace them. Then, I use compressed air to blow away dust or debris in the caliper area or clean the disc surface with alcohol. If there's rust or minor scratches on the disc, I lightly apply the brakes several times to remove them. For deep scratches, resurfacing or replacing the disc might be necessary. Don’t forget to lubricate the caliper guide pins, but avoid grease to prevent fire hazards. Also, check the brake fluid level—abnormal levels can cause noise. I’ve found that switching to high-performance brake pads reduces issues. Always ensure the car is securely supported on jack stands for safety. Simple maintenance saves money and extends part lifespan.

[Johnathan]

Hearing brake disc noises always makes me nervous—it's a major safety concern. The abnormal sounds are often caused by uneven wear of the brake pads, leading to unstable friction, or due to warped or uneven discs causing abnormal contact. This could be a sign of weakening in the braking system, making it even more dangerous on rainy days when stopping distances increase. It's advised to stop and check the pad thickness immediately—don't delay. Seek a professional technician for diagnosis to avoid accidents. Regular maintenance is essential, such as a quick inspection every 5,000 kilometers. For the sake of your family, frequent brake checks ensure safety.