What Causes the Squealing Noise When Braking?
3 Answers
Brake noise can be caused by various reasons, generally including the following aspects: 1. Running-in period for new cars or newly replaced brake pads leading to brake disc noise. New cars or newly replaced brake pads have a running-in period during which some noise may occur. Typically, the noise will disappear after the car has been driven for a few hundred kilometers. 2. Normal signal of ABS system activation. During emergency braking, the brake pedal may produce a continuous sound similar to 'thud-thud-thud,' sometimes accompanied by a 'pedal pulsation' phenomenon. This is caused by the activation of the ABS system and is normal. 3. Severe wear of brake pads triggering warning. Severe wear of brake pads can also cause brake noise. Most brake pads have a warning indicator. When the brake pads wear to their limit, the warning indicator will rub against the brake disc, producing a sharp sound. At this point, the brake pads should be replaced immediately to avoid accidents. 4. Severe wear of the brake disc. Severe wear of the brake disc can form deep grooves on the disc. Friction between the brake disc and the edges of the grooves can produce noise. If the grooves are not deep, the edges of the brake pads can be polished. If the grooves are deep, the brake disc needs to be replaced. 5. Foreign objects between the brake disc and brake pads. Small stones or a water film may exist between the brake disc and brake pads, which can cause noise. This can often be resolved by pressing the brakes a few more times or by removing the small stones.
When braking, there's a screeching sound. As an experienced driver with many years behind the wheel, I often encounter this issue. Usually, this noise means the brake pads have worn down significantly, and the small metal indicator inside starts scraping against the brake disc, screaming to remind you it's time for a replacement. If it happens after rain or the car has been parked for several days, rust on the brake discs can also cause such noise. Sometimes, dust kicked up by tires or small stones stuck in the gaps can lead to the sound as well. Don't underestimate this problem—it directly affects braking performance, potentially causing failure to stop in emergencies and increasing accident risks. I always advise friends to get it checked at a professional shop immediately, along with replacing brake pads and cleaning the brake system to ensure daily driving safety. Preventive measures are simple: make it a habit to inspect the brakes every season—it saves money and gives peace of mind.
I think screeching brakes are quite common, probably caused by worn-out friction material on your brake pads or scratches on the rotors. Having played with cars for years, I've encountered this several times, especially in damp and cold weather when rust-induced noise is more likely. A simple self-check method is to brake at low speed to locate the sound source, or check for foreign objects near the tires. Don't delay fixing it - reduced noise might mean longer stopping distances, seriously affecting handling. I'd suggest checking the brake fluid level while you're at it; low levels can indirectly cause noise. A trip to the shop for new brake pads usually solves it at minimal cost. If budget allows, upgrading to ceramic brake pads can reduce noise and enhance overall driving pleasure.
