What Causes the Abnormal Noise in Mercedes-Benz C-Class at Low Speed?

[May]

Fractured gear teeth on the drive wheels, loose connecting components of the wheels, or insufficient lubrication of many parts can all cause abnormal noise in a Mercedes-Benz C-Class at low speed. It is recommended to promptly visit a 4S shop for repairs; otherwise, the consequences could be severe. Extended Idling Time: The time required for the engine to reach normal operating temperature becomes longer, and the speed at which gasoline evaporates after being sprayed onto the back of the valves slows down, leading to carbon buildup. If idling is prolonged, the amount of air entering the engine decreases, reducing the scrubbing effect on carbon deposits and promoting their accumulation. Using Clean Gasoline: Impurities in gasoline are the main components of carbon deposits, so gasoline with higher cleanliness is less likely to form carbon deposits. However, higher-octane gasoline does not necessarily mean higher cleanliness; it simply has a higher octane rating. Adding a cleaning agent to the gasoline can gradually activate existing carbon particles and slowly remove them, thereby protecting the engine from damage. However, caution is needed when using cleaning agents, as inferior products may have the opposite effect.

[QuinnAnn]

I had a similar experience with my Mercedes-Benz C-Class, hearing strange noises at low speeds, especially when turning or braking. The most common causes are worn brake discs or pads that have become too thin, resulting in squeaking from friction; or issues with the suspension system, such as aging ball joints or shock absorbers that creak on uneven roads. Another possibility is uneven tire wear causing rubber friction sounds. Personally, I would first check the tires and brake pads—maybe replace the pads myself—but it's best to get a professional diagnosis, as the Mercedes chassis is complex, and DIY attempts could end up costing more. Preventive measures include regular maintenance, checking the suspension every 5,000 km. Just because there's less noise at high speeds doesn't mean everything's fine—low-speed noises are often early warning signs.

[StLayla]

Low-speed abnormal noises are not uncommon in Mercedes-Benz C-Class models. From my experience, they are usually caused by loose chassis components, such as worn ball joints or control arm bushings, resulting in noticeable metal friction sounds. It could also be related to the braking system, where foreign objects are stuck in the brake pads or improper installation occurs. Transmission issues may also be a factor, as rough shifting at low speeds can produce clunking sounds. I advise everyone not to ignore these minor noises, as they may indicate potential suspension failure, posing significant risks at high speeds. It's recommended to start with simple checks, such as inspecting tires for bulges and measuring brake pad thickness, to address issues early and save time and money. Additionally, avoiding sudden braking and sharp turns during daily driving can help extend component lifespan.

[JuniperLee]

My Mercedes C often makes squeaking noises at low speeds, which is quite annoying. After checking, I found that it's mostly brake-related issues, like rusted or unevenly worn brake discs causing friction sounds. Sometimes, loose suspension components, such as a damaged ball joint, can also be the culprit. Worn transmission half-shafts might produce a clunking sound. It's best to get it fixed promptly to avoid minor issues turning into major troubles. I recommend checking fuses or simple components first to avoid delays.