Why Do Brakes Make Noise?

[DelSavannah]

Reasons for brake noise: 1. The brake pads have reached the warning line or are worn out, which mostly causes a sharp metal friction sound. If this is accompanied by reduced braking effectiveness, this can be confirmed as the cause; 2. Harder brake pad materials are more prone to causing noise, while softer materials are less likely to produce such abnormal sounds, but they wear out faster and thus require more frequent replacement compared to harder materials; 3. Improper installation of the brake system can cause abnormal sounds, and it is necessary to have a professional mechanic at an auto repair shop or 4S store inspect it. The function of the car's brake system is to forcibly decelerate or even stop a moving car as required by the driver; to keep a parked car stable under various road conditions (including on slopes); and to maintain a stable speed for a car going downhill.

[Dorothy]

Having driven for over twenty years, I've found that when there's a noise from the brakes, it's usually because the brake pads are worn too thin or have small stones or dust stuck to them. Sometimes, after rain, the brake discs rust and produce a screeching sound. Another possibility is that the brake calipers are not tight enough, causing excessive gap, which results in a creaking noise when pressed. These are common issues, and it's advisable to regularly check the thickness of the brake pads. Generally, if the thickness is below 3mm, they should be replaced to avoid brake failure at high speeds. I've experienced this myself and immediately drove to the repair shop to get it cleaned, after which it became quiet. Don't forget to do a comprehensive maintenance during seasonal changes to reduce the risk of rust.

[BeckettAnn]

Aging auto parts or design flaws often cause brake noise. Issues like uneven brake disc surfaces, debris stuck causing friction, or deformed dust shields scraping the disc can all produce squeaking sounds. Electrical problems, such as faulty relays, can also generate noise. Don't panic immediately—first check if tire pressure is normal, as it indirectly affects brake system pressure. I often notice louder noises during rainy test drives, possibly due to moisture accelerating corrosion. Get it inspected promptly to ensure calipers and sensors are intact, extending overall lifespan.

[DiAnastasia]

When I first started driving, the brakes would squeal loudly whenever I pressed them. A friend told me it might be due to insufficient break-in of new car parts or foreign objects stuck on the pads. For example, snow and salt on the road can attract dust, leading to noise. Over time, I got used to it, and regular cleaning can help improve the situation. Rust is also a major cause; if the car sits too long, rust forms, and a light press can produce a grinding sound. As long as there's no accompanying vibration or failure, it's generally safe and not a concern.

[McJosiah]

Brake noise mostly stems from physical friction, such as hard spots in brake pad materials colliding with the disc surface, or thermal deformation at high temperatures causing resonance. Unstable current passing through components can amplify the noise. Another common cause is insufficient lubrication due to oil contamination. For maintenance, I recommend checking the brake pad thickness monthly, cleaning accumulated debris inside the wheel cavity, and minimizing dust ingress. After installing new parts, remember to run a 100-kilometer break-in period, during which the noise will gradually fade. Ensure the system cools properly to avoid overheating deformation.

[LaTalia]

From a safety perspective, brake noise should not be ignored as it may indicate component failure such as loose calipers or aging wiring causing short circuits. Noise accompanied by vibration is even more dangerous. I once experienced severe noise at high speed, which turned out to be a blown fuse upon inspection. Prompt action is crucial: pull over to check the tires, and seek professional repair immediately if issues are found. Daily maintenance like keeping the parking area dry helps reduce moisture corrosion. Even simple tests like gently pressing the brake pedal a few times can help diagnose the cause.