What are the causes of brake pad noise?

[NatalieDella]

There are several reasons for brake pad noise: 1. The brake pads emit a sharp, screeching sound. This piercing noise is caused by the fault alarm piece of the brake pad, which may indicate that the brake pads are worn out or there are foreign objects on them. Solution: When encountering a screeching sound from the brake pads, the first step is to check whether the brake pads are worn out or if there are any foreign objects. If the brake pads are worn out, they should be replaced immediately. If there are foreign objects, remove the brake pads, take out the foreign objects, and reinstall them. 2. If the sound is a dull noise, it is mostly due to problems with the brake caliper, such as wear on the sliding pins or detachment of the spring plates. Solution: Immediately check the brake caliper for wear on the sliding pins or detachment of the spring plates. If found, replace them immediately. 3. If the sound is a hissing noise, there could be multiple issues, including problems with the caliper, brake disc, or brake pads. If the noise persists, first check for dragging brakes. Poor caliper resetting can cause prolonged friction between the disc and pads, leading to abnormal noise under certain conditions. If the noise occurs right after installing new pads, it may be due to inconsistent dimensions between the new pads and the friction blocks. Solution: First, check the caliper, brake disc, and brake pads for any friction issues. If the noise is from newly replaced brake pads, wait for the new pads and friction blocks to fully break in. 4. If a clattering noise occurs after driving for a while, it may be caused by loose attachments on the brake pads. Solution: Check if the attachments on the brake pads are loose. The best solution is to reinforce them or replace the brake pads with new ones.

[VanArya]

I've been repairing cars for over 30 years, and brake pad noise is a frequent issue. It's mostly caused by metal hard spots or foreign objects stuck on the brake pad surface, which squeak during friction. Improperly tightened screws or misalignment during installation can also lead to noise. If the caliper doesn't retract properly, the brake pad keeps rubbing against the disc, slowly creating scratches that cause noise. Environmental factors like rainy days or dusty roads can also trigger noise as moisture dries or debris accumulates. More importantly, long-term neglect can lead to brake disc deformation, increasing repair costs. I recommend car owners regularly check pad thickness; using a caliper, as long as it's not less than 5mm, it's fine. If you hear any noise, immediately visit a professional shop for inspection and repair—don't delay. Safety comes first; there's no room for carelessness.

[BrooklynRose]

As an ordinary person who drives every day, I've encountered brake squealing several times. The main causes include excessively worn brake pads where the metal backing plate directly scrapes the disc; new pads being made of harder material or containing impurities, causing noise with light braking. Loose installation or screw loosening are also common root causes. Sounds are often heard after car washes or during rainy season startups, which is caused by dried water stains affecting the friction surface. If not repaired promptly, braking distance may increase, threatening driving safety. I personally check pad thickness every few months - just measure with a tape measure; it's recommended to have pads replaced at a reliable repair shop - don't skimp on this small expense.

[McAniyah]

I'm into car modifications, so I'm very familiar with squeaking issues. It's usually caused by new brake pads that haven't been properly bedded in, with uneven surfaces or small stones stuck in them. When switching to high-performance pads, the harder material makes them more prone to noise. For DIY inspection, use an air gun to clean dust from the calipers; if the rotor has fine scratches, it can also cause squeaking. Address it promptly to avoid accelerated wear and rotor damage. I always keep spare parts on hand for quick replacement.

[LilahFitz]

I've been driving for half a century, and brake noise always has a reason. It's mostly caused by hard spots on the brake pads or rust leading to friction sounds, especially noticeable in cold seasons. Older car models with inferior materials are more prone to this issue. The key is not to ignore early warning signs; even slight noises, if neglected, can cause grooves or cracks on the discs. I regularly visit the 4S shop for thorough inspections and clean the wheel hubs to prevent debris buildup.

[DeVivian]

My car often runs in the city, and the brake noise has been bothering me. After washing the car, water stains dry and leave marks, or if debris gets stuck on the surface of the pads, it can cause noise. Misalignment during installation leading to uneven friction is also a factor. If the pad material is too hard or the backing plate comes loose, it will produce a warning sound; not replacing them promptly increases braking distance and affects safety. I've learned to check the brake pad wear indicator weekly—just shine a phone flashlight on it. When getting repairs, specifying reliable brand pads gives me more peace of mind.