Why does the car make a brake pad noise when it first starts moving?
4 Answers
If there are foreign objects between the brake pads and the brake discs, it will cause abnormal noise. Below is the relevant introduction: Car brake pads: Car brake pads, also known as brake linings, refer to the friction materials fixed on the brake drums or discs that rotate with the wheels. The friction linings and blocks within them bear external pressure and generate friction to slow down the vehicle. 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 is monitored using an SMT-4 furnace temperature tracker to ensure the temperature distribution during the coating process and guarantee quality. Braking principle: The working principle of brakes mainly relies on friction. By utilizing the friction between the brake pads and discs, as well as between the tires and the ground, the kinetic energy of the moving vehicle is converted into heat energy through friction, bringing the car to a stop.
It's quite common to hear a squeaking sound from the brake pads when the car first starts moving. The main reasons are usually minor dust on the brake disc surface or friction caused by water accumulation after rain. Especially if the car hasn't been driven for a while, small rust spots can form on the brake discs, causing noise when starting off, but it typically disappears after driving for a bit. For new cars, the brake pads might still be in the break-in period, which can also cause noise. I suggest not worrying too much at first—drive for a few more days and observe. Short-term noise is usually not a problem. However, if the noise persists every time or the brakes feel softer, you must visit a repair shop for inspection, as there might be issues like worn brake pads or loose installation. Never take driving safety lightly. Regularly cleaning brake dust during car washes and keeping the brake system dry can help reduce such occurrences.
I've also experienced squeaky brake pads when starting the car, which is quite annoying, especially after the car has been parked overnight in cold weather. It's mostly caused by weather changes, such as moisture leaving a thin film of water on the brake discs or dust accumulation. Don't worry too much - you can try driving at low speed for a short distance to let it wear off naturally, but avoid long-distance driving as a test. If the noise persists or you notice significantly reduced braking performance, get it checked at a professional repair shop immediately. Safety comes first - brake failure would be dangerous. I personally inspect my brake pad thickness every six months to prevent minor issues from worsening. Also, remember to warm up the brakes before driving in rainy weather to reduce unexpected noises.
As someone who enjoys tinkering with cars, I believe that brake pad squeaking during startup is usually a minor issue. The common causes are slight rust or debris on the brake disc surface. You can try wiping the edges of the brake disc with a clean cloth while parked, but make sure to do so safely without disassembling any parts. If DIY methods don't work, don't delay—have a technician check the brake pad wear or installation immediately. Persistent squeaking may indicate a bigger problem, so timely inspection can prevent higher costs. By the way, keeping things clean can prevent such troubles—just pay extra attention to the brake area during car washes.
