What Causes the Abnormal Noise When Braking?

[LaKira]

ABS's working process is actually a cyclic process of locking-releasing-locking-releasing, keeping the vehicle in a state of intermittent rolling at the critical lock point. When you press the brake pedal hard and trigger the ABS, a clunking sound will occur, which is normal. In this case, just press the brake pedal firmly to the end. Here is an introduction to the abnormal noise from the gear when braking: 1. If you hear a "clunk" sound between the transmission and the gear lever when stepping on the brake pedal, the main reason for the sound may be the electronic linkage between the brake system and the automatic transmission. When you step on the brake, the transmission solenoid valve will open and make a "clunk" sound. At this time, you need to press the gear lever lock button to shift gears. 2. If the clunking noise also occurs during light braking, or if the vehicle does not have an automatic transmission lock button at all, or if the noise is continuous or intermittent, then you need to pay attention. It is very likely that the brake system has malfunctioned or a connecting component in the chassis has become loose.

[DeclanLynn]

A squeaking noise when pressing the brake pedal is usually caused by common component issues. I suspect it might be due to severely worn brake pads—after prolonged use, the thinning material can produce a high-pitched sound—or rust/scratches on the brake discs. Another possibility is loose caliper components with trapped sand or debris, causing friction noise when braking. Some new cars may also produce such sounds right after brake pad replacement, which is normal during the break-in period. For self-inspection, use a flashlight to check the brake pad thickness; replace them if below 3mm. Remember, regardless of the cause, never ignore such noises—visit a certified repair shop promptly for diagnosis. Safety first.

[OCole]

Whenever I hear brake squealing, I think of a few simple causes, mainly related to brake pads. For example, severe pad wear or uneven surfaces can cause squeaking under pressure. It could also be that new pads haven't been properly broken in, and the noise will disappear after a few days of driving. Additionally, foreign objects like small stones stuck in the brake discs are quite common, and rust from heavy rain can also cause strange noises. I recommend car owners to regularly maintain and check their brakes, and clean out any debris when necessary. If the noise is severe, don't delay—saving a little money now could lead to bigger problems later. Find a trusted mechanic to inspect and ensure the brake system is in good working order.

[ZoeMarie]

Brake noise may indicate serious hidden dangers, such as excessive wear of brake pads or foreign objects embedded, which can cause friction sounds or squealing. Failure to repair may result in longer braking distances or accidents. This phenomenon is common in older vehicles or after rusting in rainy seasons. Upon discovery, immediately stop to check the basic condition; if it cannot be alleviated, quickly go to a professional shop for repair. Safety always comes first, don't wait until the car has problems to regret it.

[DiSadie]

I remember my car made the same noise last time, and it became quiet after driving for a while. I checked it myself and found that there were rust spots on the edge of the brake pads, and it happened to be raining, so they squeaked when I stepped on them. Later, I had them cleaned and polished at a small shop, and the problem was solved—super simple. Don’t rush to spend money on new parts for minor issues; try simple methods to remove debris first. Long-term neglect of brake system maintenance can worsen risks, such as uneven wear on discs and pads, which increases noise.

[MacAlexander]

Don't panic when hearing brake noises - the causes vary: worn brake pads producing scraping sounds, debris caught in the calipers, or rust on the brake disc surface. You can try gently pressing the brakes a few times to dislodge foreign objects; if that doesn't work, visit a shop to check voltage balance and wear levels. For prevention, it's recommended to inspect brake component thickness every six months and maintain cleanliness to avoid water accumulation and corrosion. These practices can extend service intervals and save money, but remember - being able to stop reliably in critical moments is what truly matters.