Why does the car make abnormal noises when braking at low speeds?

[DiPeter]

Car braking at low speeds produces abnormal noises for the following reasons: 1. Generally, faults in the caliper, brake disc, or brake pads may cause this noise. If the noise persists, the first step is to check for dragging brakes, as poor caliper resetting can lead to prolonged friction between the disc and pad, producing abnormal noises under certain conditions. 2. If the noise occurs immediately after installing new pads, it may be due to a size mismatch between the new pads and friction blocks, or it could be a normal noise during the break-in period of new parts. New brake pads and discs require a break-in process, and when braking, if it happens to grind against a hard spot on the pad (due to the material of the brake pad), this noise will occur. 3. When there are sand or gravel particles stuck between the brake pads and disc, it can also produce such noises. 4. Severe wear of the brake pads can also cause abnormal noises, which is a signal to the owner to replace the brake pads.

[VanPenelope]

When the car makes abnormal noises during low-speed braking, it's usually due to dust or small stones stuck on the brake pads. Frequent braking in city driving can cause these particles to accumulate. Especially on rainy days or in humid conditions, the noise may become louder. Another common cause is excessively worn brake pads, where the exposed metal part scrapes against the brake disc, producing a squealing sound. New cars may also produce slight noises initially, which is part of the normal break-in process. If the abnormal noise persists or worsens, it indicates reduced braking efficiency, directly affecting driving safety. It's recommended to visit a repair shop for inspection when possible. Technicians will check the thickness and condition of the brake pads to determine if replacement or cleaning is needed. Don't ignore such minor issues; while high-speed braking may seem normal, continuous noise at low speeds could indicate hidden greater risks.

[DeKingston]

A while ago, every time I braked slowly at intersections, I heard a rattling noise that really freaked me out. Later, I took it to the auto repair shop, and they said the brake pads were wearing unevenly, and the moisture from rainy days made the noise worse. With all the stop-and-go traffic in the city, the pads wear out faster. Now, I make it a habit to check the brake pad thickness myself every month and replace them if they're too thin. If the noise lessens after washing the car, it's usually just a dust issue. But if the sound persists, it's important to take it seriously—even at low speeds, brake failure can lead to rear-end collisions. I’ve become extra cautious about this, especially when driving with my kids. Safety is not something to take lightly.

[Walter]

Brake noise at low speeds is mostly caused by dirt on the brake pads or excessive wear exposing the metal, such as dust accumulation on the pads causing squeaking when rubbing against the disc; the sound is more noticeable when the brake discs are wet after rain. Slight noise during the break-in period of a new car is normal and will go away after some time. You can quickly check it yourself: see how much brake pad thickness is left or listen to the source of the noise. Sometimes braking a few times after washing the car to clear dust helps. If the noise gets louder or persists, don't delay—reduced braking performance threatens safety. After simple handling, you can drive with peace of mind.