What Causes the Squeaking Sound When Applying Brakes in a Sedan?

[Kayden]

It may be due to the use of low-quality or overly hard brake pads. Below are relevant explanations regarding abnormal noises during braking: 1. Excessive clearance between the brake disc and brake pads: Generally, if the brake disc surface has excessive clearance, slight vibration may occur in the brake pedal when braking at high speeds. This vibration can also be transmitted to the steering wheel through the related steering system, causing the steering wheel to shake left and right. After resurfacing the brake disc, it can be reused. 2. Surface imbalance or deformation: The braking system has high requirements for surface flatness. Some brake discs or pads may have dirt or debris on their surfaces; alternatively, deformation caused by heat can lead to unevenness, which in turn causes vibration. 3. Other issues: If the problem is not during braking but during normal driving—for example, when the speed is between 60~80 km/h, slight steering wheel vibration is noticed, which disappears when the speed decreases—it is likely an issue with the four-wheel alignment data. In this case, the only solution is to visit a 4S shop or repair shop for a four-wheel alignment adjustment.

[LePaislee]

I've experienced this issue too. When I stepped on the brakes in my old car, it made a squealing sound, usually because the brake pads were worn too thin, and the metal shims installed on them started grinding against the brake rotors, creating a warning noise. Last month, I just replaced a new set of pads, and the noise disappeared immediately. Other possibilities include rust or debris on the brake rotors, especially after parking in rainy weather when moisture causes temporary oxidation noise on the rotor surface. If it's a new car occasionally making noise, it might be due to improper installation or the new pads' break-in period. Don't underestimate this sound—delaying repairs can damage the brake rotors and cost you more in the long run. I recommend regular brake system inspections, having a professional shop take a look every 20,000 kilometers or so to ensure smooth driving. Remember, safe driving relies on detailed maintenance—don't wait until something actually breaks to fix it.

[VonTucker]

The squealing sound when braking makes me a bit nervous, as it's often a signal that the brake pads have reached their wear limit. That metallic grinding noise is reminding you to replace them soon. My car used to make loud noises during hard braking, and it turned out to be due to uneven brake disc surfaces or oil contamination, with accumulated dust and debris causing the abnormal sound. Another time, after parking for a few days in damp, cold weather, the discs rusted and made noise, which disappeared after driving for a while. But ignoring it could lead to worse issues, like malfunctioning calipers or stuck pistons, resulting in brake failure. Every time I hear this sound, I go to the repair shop, where the mechanic uses instruments to measure the thickness—very reliable. Developing good driving habits, such as avoiding sudden braking and regular maintenance, can prevent major problems, saving money and ensuring peace of mind. Driving safety is paramount, so never delay addressing any unusual noises.

[Olivia]

My car makes a squeaking sound when I press the brakes, mostly due to new brake pads not being properly worn in or old pads being too thin and causing friction noise. It's not difficult to check—I'll try to measure the thickness of the brake pads; if it's below 3mm, they should be replaced. Other common causes include rust on the rotors or mud sticking to them, especially noticeable after rain. But if the noise persists after a DIY inspection, it's best to have a professional check the wiring or calipers—don't attempt to dismantle them yourself. Addressing the issue early can prevent more expensive repairs and reduce road risks. Maintaining your car requires diligence.