What Causes the Noise When Braking a Car?
4 Answers
Reasons for noise when braking a car: 1. Severe wear of brake pads, usually caused by brake pads reaching the warning line or being completely worn out, with the noise mostly being a sharp metal friction sound; 2. Noise caused by the material of the brake pads, generally harder brake pad materials are more likely to produce this type of noise; 3. Improper installation of the brake system causing noise. Car brake pads, also known as car brake linings, refer to the friction materials fixed on the brake drum or brake disc that rotates with the wheel. The friction lining and friction block within them bear external pressure to generate friction, thereby achieving the purpose of vehicle deceleration. Car brake pads are generally composed of steel plates, bonded heat insulation layers, and friction blocks. The steel plates are coated to prevent rust, and the coating process uses an SMT4 furnace temperature tracker to monitor the temperature distribution during the coating process to ensure quality.
Last time I was driving on the highway, the brakes made noise, and I found this is quite common. The issue might be due to the brake pads being too thin. When brake pads are severely worn, the metal backing inside can grind against the brake disc, producing a squeaking sound, as annoying as scratching a blackboard. Another possibility is rust on the brake discs, especially after driving in the rainy season or by the sea, where rust can cause friction and noise. Also, I've experienced foreign objects getting stuck between the brake pads and discs, like small stones or sand, which require immediate cleaning. Regular maintenance is crucial, and I recommend checking the brake system every 10,000 kilometers to prevent the situation from worsening. Excessive noise can also affect braking performance. Once, I didn't address it in time before a red light and almost rear-ended another car. Safety comes first—don't ignore these small issues. A professional inspection at a reputable shop can always solve the problem.
I've been driving for over 20 years and have encountered many instances of brake noise, which are generally caused by several factors. When brake pads are of poor quality or worn out, uneven friction material can easily cause a humming sound; sometimes, the surface of the brake disc becomes uneven, with pits and bumps, leading to a clunking noise when braking; if the bolts of the brake caliper are loose or there's insufficient lubrication, the movement becomes less smooth, also producing noise. Especially when driving on mountain roads with frequent braking, wear and tear accelerate. I remember last winter, the noise was more frequent, probably due to inconsistent thermal expansion and contraction of the metal. It's important to regularly clean brake components to prevent dust buildup that can exacerbate friction. I recommend everyone to check their brakes frequently and not skimp on quality parts—safety concerns the whole family.
The squeaking noise from my brakes during daily commutes is quite annoying. It could be due to severely worn brake pads, where the internal warning metal strip rubs against the rotor as an alert; or accumulated dust or oil residue on the brake discs causing a screeching sound during friction. Sometimes, it's caused by loose components in the braking system, like improperly secured springs that rattle continuously. The noise often becomes more noticeable after driving in rainy conditions, as moisture causes parts to rust. I've done a basic check myself—inspecting if the brake pads still have sufficient thickness (generally, they need replacement if worn below 3mm). If unable to handle it myself, I visit a repair shop for a quick fix. Don’t delay repairs, as minor issues can escalate and affect other components. Safe driving is the bottom line.
