What Causes Abnormal Brake Noises in Cars?

[WillowLee]

The causes of abnormal brake noises in cars include foreign objects between the brake drum or disc and the shoe, the use of inferior or overly hard brake pads, and abnormal shock absorbers. Car brake pads, also known as car brake linings, refer to the friction materials fixed on the brake drum or disc that rotates with the wheel. The working principle of brakes mainly comes from friction, utilizing the friction between the brake pads and the brake disc, as well as between the tires and the ground, to convert the kinetic energy of the moving vehicle into heat energy through friction, thereby stopping the car. A good and efficient braking system must provide stable, sufficient, and controllable braking force, and have excellent hydraulic transmission and heat dissipation capabilities to ensure that the force applied by the driver on the brake pedal is fully and effectively transmitted to the master cylinder and each wheel cylinder, while avoiding hydraulic failure and brake fade caused by excessive heat. Here are the solutions for abnormal brake noises: Press the brake pedal hard several times or perform emergency braking several times in an open area. It is necessary to replace the car's brake pads in time to prevent potential dangers. Check the lubrication of the shock absorber's top rubber or buffer rubber.

[VincentMarie]

In my years of car repair experience, brake noise is a common complaint. When brake pads wear down to the wear indicator layer, they squeak to remind you they need replacement. If the disc surface is rusty or contaminated with dust and sand, it can also produce noise during friction. Lack of lubrication in calipers or guide rails can cause brake pads to rattle. New cars sometimes have overly hard brake pads that require a break-in period, and wet discs after rain may temporarily make noise. The key is not to delay, as neglect can accelerate wear and lead to disc warping, resulting in higher repair costs. I recommend car owners check brake component thickness and lubrication every six months. Timely maintenance can prevent safety incidents.

[RowanLynn]

I just got my driver's license not long ago, and whenever I hear strange noises when stepping on the brakes, I feel like the car is falling apart. After researching, I found out there are various reasons: a small metal piece makes noise when the brake pads wear down, or small stones get stuck in the gaps and cause friction sounds. It's especially noticeable on rainy days because moisture wets the metal surfaces. Don't panic—occasional noises aren't urgent, but it's best to have a technician check it out soon. It's hard to judge the wear level yourself, so it's better to schedule regular maintenance at the shop. Replacing original brake pads only costs a few hundred bucks, but ignoring it could lead to real problems. I've developed a habit of simply cleaning dust off the wheels during monthly car washes to prevent issues.

[KylieLee]

After years of driving kids around, saving money is key. The main cause of brake squealing is worn-out brake pads—just check the deep or thin wear on the brake disc edges to confirm. Sometimes minor rust or dirt can cause noise, which stops after a rinse with water. If the squeaking persists, don’t hesitate to replace the parts; ceramic pads are pricier than semi-metallic ones but quieter. Regular maintenance is crucial—avoid harsh braking to prevent overheating and inspect every 20,000 km. Prevention is far cheaper than repairs and extends brake disc life, keeping your family safe on the road.