What are the causes of brake noise after vehicle startup?
4 Answers
Vehicle startup after the brake noise causes are: 1, too slow to release the brake caused; 2, the new replacement of the brake pads running-in is not in place; 3, sand particles into the middle of the brake pads and brake discs; 4, the brake disc fixing screws are lost or damaged; 5, the brake system failure. The brake maintenance methods are: 1, high temperature protection, to prevent the brake system corrosion, to prevent the brake pads due to high temperature surface bite, to eliminate the brake pads scream; 2, regular replacement of brake oil; 3, clean the brake discs, brake drums and any parts of the oil stains, dirt and friction dust, to maintain the brake disc heat dissipation good; 4, regular inspection of the thickness of the brake pads or brake shoes.
As a veteran driver with decades of experience, I've encountered numerous cases of brake noise after vehicle startup. The most common cause is rust on the brake discs, especially when starting the car after rain or overnight in humid conditions. The oxidized disc surface rubbing against the brake pads produces a squeaking sound, which sounds harsh but isn't a major issue. If the noise persists, you should be alert to the possibility of brake pads wearing down to the metal layer or sand/small stones stuck in the gaps causing scraping. I once had an old car with frequent noise issues, and inspection revealed dried-up lubrication points on the calipers - applying special grease solved it. In daily driving, avoid frequent short-distance braking to allow the system to fully heat up through friction, which can reduce noise. Try parking in dry locations when possible, and gently applying the brakes a few times after rainy weather to remove rust is also effective. If you're unsure, it's best to have a mechanic inspect it - safety comes first.
My new car has experienced brake squealing several times in just two years of driving. That morning when I started the car to go to work, it made a screeching sound that really put me on edge. Later, after self-inspection, I found it was because the brake discs had rusted after washing the car and not drying properly. The noise naturally disappeared after driving a few hundred meters as friction generated heat. A friend taught me to use a soft brush to clean accumulated dust and grime from the wheel hubs, emphasizing that regular maintenance is crucial. If the noise resembles metal scraping, it might indicate worn-out brake pads needing replacement, or small stones lodged in the calipers that require careful removal. Squealing is more common in humid weather, so I’ve developed a habit of lightly pressing the brakes a few times when starting the car to warm up the system and alleviate the issue. Experience has taught me not to panic—most cases are minor issues, but neglecting them can damage brake performance. Pay attention to changes in the frequency and volume of the noise, and addressing it promptly either by DIY or consulting an expert can save significant costs.
As a safety-conscious driver, I never ignore abnormal brake noises when starting the vehicle, as they may indicate hidden dangers. The most common causes of such noises are rust on brake discs, surface dirt, or debris accumulation, which produce screeching sounds during friction, affecting brake response and stopping power. While some noise during the break-in period of a new car is understandable, frequent noises in older vehicles warrant checks on brake pad thickness and the hydraulic system. Noises caused by thermal contraction of components during cold starts are particularly hazardous—I once witnessed a neighbor's car nearly causing an accident due to delayed braking for this reason. If you notice any issues, immediately slow down and pull over to check for visible wear or fluid leaks; professional inspection can prevent accidents. Regular maintenance, including cleaning wheel hubs and keeping the brake system dry and clean, is key to daily prevention.
