What is the sound of a car making a scratching noise?

[BennettAnn]

Car making a scratching noise is the sound produced by engine oil, possibly due to reasons related to the oil. Inferior quality oil, prolonged intervals without oil changes, or insufficient oil levels can easily increase friction between the valves and guides, as well as in components like hydraulic lifters, thereby amplifying various noises within the engine. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), with a density of approximately 0.91×10³ (kg/m³), serves to lubricate and reduce wear, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and cushioning for the engine. It is hailed as the 'blood' of the car. 2. Composition: Engine oil consists of two parts: base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil's performance, endowing it with certain new properties, making them an important part of lubricating oil.

[VanLillian]

This kind of squeaking sound resembles friction noise, usually originating from the car's braking system or drive belt. When brake pads are nearly worn out, a continuous scraping noise occurs upon braking; another common cause is a loose or aged engine belt, which rubs against engine components while rotating. I recommend checking the tires, as small stones lodged in the tread can produce similar sounds, especially noticeable during low-speed turns. Additionally, loose suspension components may cause similar abnormal noises—for example, loose shock absorber screws can create rhythmic friction. Ignoring the issue not only leads to annoying noise but may also cause complete brake system failure, increasing driving risks. Therefore, it's best to drive to a repair shop as soon as possible for a professional mechanic to diagnose and fix the issue.

[LeBeckett]

Last time while driving, I suddenly heard a grinding noise. At first, I thought the tires had run over something, but later discovered it was caused by direct metal-on-metal contact between the brake disc and brake pads. The sound was especially screeching when decelerating, like sandpaper rubbing, which made me quite nervous. After stopping the car, I tried touching the wheel hub and found it extremely hot, realizing there was an issue that needed attention. At the repair shop, the diagnosis confirmed the brake pads were completely worn through. After replacing them, everything returned to normal. I believe in such situations, one shouldn't hesitate—immediately noting when the noise occurs (whether during acceleration or idling) can help mechanics pinpoint the problem faster.

[DeBrooklyn]

Abnormal noises are definitely a red flag. Squeaking or grinding sounds often indicate brake component wear or belt slippage, and ignoring them could lead to major safety issues. I've come across cases where owners didn't address it promptly, resulting in overheated brakes that completely damaged the discs and pads, significantly increasing accident risks. Once you hear such noises, you should immediately slow down, pull over, and inspect. Try to identify whether the sound is coming from the front wheels, rear wheels, or the engine bay. Regardless, don't risk continuing to drive—contact a professional mechanic as soon as possible to prevent more severe consequences.

[VonRyder]

The squeaking noise is commonly found in poorly maintained older vehicles, such as friction sounds caused by long-overdue brake pad replacements or uneven tire tread wear. I recommend developing good maintenance habits: check brake pad thickness every 5,000 kilometers, and pay attention to engine belt tension to avoid slack. Regularly clean dust and debris from the wheel hub area after driving to reduce abnormal noises; during maintenance, have the technician check for loose suspension components. Preventing problems is more cost-effective and hassle-free than fixing them afterward, especially for owners who frequently drive long distances.

[VanLayla]

To diagnose the source of a scraping sound, start with the basics: park the car, turn off the engine, and inspect the tires for small stones stuck in the treads that may cause friction when rolling. If the noise occurs only when braking, it's likely a brake system issue; if it happens during steady driving, it could be related to the drive belt or bearings. I usually listen carefully for the sound location in an open area with the engine running, and use a flashlight to check for loose suspension components under the chassis if necessary. Avoid attempting complex DIY repairs—schedule a professional inspection to ensure accurate and safe handling.