Reasons for Friction Noise When Braking?
3 Answers
Friction noise when braking is commonly caused by issues such as noise in new cars, brake disc and pad noise, or sudden braking noise. Noise when braking in new cars: The brake pads and discs of new cars have not yet fully worn in, so they may sometimes produce a "squeaking" friction sound, which is normal. After some use, the noise will naturally disappear. Noise after replacing brake pads: After installing new brake pads, incorrect installation can cause noise. Common installation errors include installing the brake pads upside down, with the metal side touching the brake disc, resulting in braking noise. Noise due to brake disc issues: Prolonged use can cause deep grooves on the brake disc surface or deep steps at the edges. Uneven contact between the brake pads and the disc can produce noise. In such cases, the brake disc needs to be replaced or polished using a brake disc resurfacing machine. Noise from sand in the brake disc: If foreign objects like sand or small stones get between the brake pads and disc while driving, the brakes may produce a sharp hissing sound. Continuing to drive normally will usually dislodge the sand or stones, eliminating the noise. If the noise persists, the wheel may need to be removed to extract the debris. Noise during sudden braking: When braking suddenly, if you hear a noise and feel vibrations in the brake pedal, this is a normal phenomenon caused by the activation of the ABS system.
I often notice friction noises when braking while driving, which is mostly because the brake pads are almost worn out. I've experienced this situation several times myself. When the brake pads wear down to a certain thickness, the small metal tabs inside them will rub against the brake discs, producing that sharp screeching sound, as if reminding you it's time for a replacement. Additionally, if the car is parked in a damp place overnight and the brake discs rust, there will be squeaking noises when you first start driving, but they usually go away after driving for a while. Sometimes, small stones or dust get stuck in there, and cleaning the brake discs will quiet them down. I think whenever you hear any noise, you should check the thickness of the brake pads with a caliper. If they're thin, replace them immediately. Never delay, otherwise the braking distance will increase, making accidents more likely—it's just too dangerous.
If there's friction noise during braking, safety risks always come to my mind first. I've experienced this before – brake discs contaminated with oil or slightly warped can cause uneven friction, producing terrifyingly loud sounds. If ignored for a long time, braking performance declines, potentially failing to stop the car in emergencies. Another common cause is loose calipers or wheel hubs transmitting noise into the cabin. It's advisable to stop immediately upon hearing such sounds to inspect tires or brake components, and contact a repair shop if needed. When parking, avoid wet or slippery surfaces to minimize rust probability. Remember, driving safety comes first – don't wait until minor issues escalate into major regrets.
