What causes the sound of metal scraping the ground when the car is running?
3 Answers
It may be that the brake pads have reached their limit, or there is a foreign object on the tire. Here is some extended information related to car maintenance: 1. Basic introduction: Car maintenance refers to the preventive work of regularly inspecting, cleaning, supplying, lubricating, adjusting, or replacing certain parts of the car, also known as car servicing. 2. Maintenance purpose: Modern car maintenance mainly includes the maintenance scope of the engine system, transmission system, air conditioning system, cooling system, fuel system, power steering system, etc. The purpose of car maintenance is to keep the car clean and tidy, maintain normal technical conditions, eliminate hidden dangers, prevent failures, slow down the deterioration process, and extend the service life.
When repairing cars, I have encountered many cases where there is a sound of metal scraping against the ground while driving, mostly caused by displacement or loosening of chassis components. For example, loose exhaust pipe joints can rub against the ground when going over bumps, producing noise; missing bolts on the engine underguard can lead to dragging; or deformed brake disc shields scraping against the wheels. The sound is usually noticeable during low-speed acceleration or turning, resembling the clattering of metal friction. This poses significant risks, as delaying repairs may damage oil pipes or cause leakage accidents. It is advised to slow down and stop immediately upon hearing the noise, then briefly inspect the chassis for any foreign objects or obvious defects. If unsure, it's best to contact a professional repair shop for inspection, using a lift to tighten components. Regular maintenance should also pay attention to these details.
Having driven for decades, my old car once made a terrifying metal scraping sound against the road. That time it was because the heat shield screws on the rear axle came loose, causing the thin metal sheet to drag and scrape. Another possibility could be a broken exhaust pipe hanger causing friction from wobbling, or mud coating the undercarriage components during rainy seasons creating noise. The sound becomes particularly noticeable when climbing hills or making sharp turns. After parking, use a flashlight to check for scrape marks. Don’t underestimate this issue—it’s not just annoying but may also lead to tire or suspension damage. I often remind my friends: if you encounter similar situations, don’t push through. Get it checked by a professional as soon as possible—it saves money and ensures peace of mind.
