What Causes the Metal Friction Sound from the Wheels?
2 Answers
Hard spots on the brake disc, a faulty brake separation pump causing the caliper to not separate from the brake disc, or excessive wear of the brake pads leading to metal grinding can all result in a metal friction sound from the wheels. In such cases, it is necessary to visit a 4S shop for replacement. The wheel is a rotating component between the tire and the axle that bears the load, typically composed of two main parts: the rim and the spokes. The rim is the part of the wheel where the tire is mounted and supported, while the spokes are the supporting components between the axle and the rim. Methods for wheel maintenance: Maintain standard tire pressure: Tire pressure is the life of the tire. The inflation pressure must comply with the national standards specified for different types and specifications of tires. Regularly check the tire pressure, as both overinflation and underinflation can cause abnormal wear, tread groove cracking, ply breakage, ply separation, and tire blowouts. If you plan to drive continuously at high speeds, the tire pressure should be increased by 5%—10% above the standard pressure. Additionally, after driving, the internal pressure may rise due to temperature increases, and you should not release air at this time. Regular inspections are essential: In summer, due to higher temperatures, the tread becomes softer than in winter, theoretically accelerating tire wear. It is recommended to pay extra attention in summer to whether new tires are needed. Generally, manufacturers specify a tire lifespan between 80,000—100,000 kilometers (or about 5 years), but specific conditions depend on the driver's habits. Therefore, it is crucial to regularly check the tire wear to ensure safe driving.
I've been driving for many years and have encountered this situation several times. It's mainly due to brake pad issues. When the brake pads wear too thin, the metal shim inside will directly rub against the brake disc, producing a screeching sound that resembles metal scraping against metal, especially noticeable during turns or when braking. Alternatively, it could be caused by a small stone or debris stuck in the brake or wheel gap, which also creates a very loud noise when rubbing. I recommend paying attention to the direction of the sound, such as whether it's coming from the front left wheel or rear right wheel, to help narrow down the problem. If it's simple, you can check around the wheels for any foreign objects yourself, but it's best not to drive long distances to avoid accidents. Remember to regularly maintain the brake system; replacing new brake pads can prevent this issue, saving you from emergency repairs and unnecessary expenses.
