What to do if the Mercedes-Benz C-Class has brake noise?
3 Answers
First, observe the location of the brake noise. The majority of brake noises originate from the brake pads, accounting for more than 80% of cases. The noise from the brake pads is usually caused by the scraping sound when the pads are worn out, in which case the brake pads need to be replaced. Here is an introduction to brake pad noise: 1. Approximately 10% of brake pad noises are caused by issues with the brake disc, usually due to deformation of the disc. This results in a wobbling motion while driving, which rubs against the brake pads and causes noise. In this situation, simply repairing and grinding the disc can resolve the issue. Another common cause is minor rust on the brake disc due to the car being unused for a long time. The brake pads rubbing against the rust cause the noise, but this is not a major concern. Just drive safely for a while, and the surface rust will wear off. 2. Another 10% of brake noises are caused by loose brake shields, improper installation after disassembly, or damage to parts after an impact. Troubleshoot or repair the issue based on the sound of the brake noise.
My own Mercedes-Benz C-Class has experienced brake noise, which is quite a common issue, mostly caused by worn brake pads. Dust accumulation or small stones stuck on the brake discs can also trigger squeaking sounds. First, check the thickness of the brake pads—a simple method is to squat down and peek through the wheel gap; if the pad thickness is below 3 millimeters, it's time for a replacement. Also, pay attention to the source of the noise. If it only occurs on rainy days, it might just be a moisture issue that will fade after driving for a while. However, don’t ignore it, as prolonged noise can accelerate brake disc wear, increase repair costs, and, more dangerously, reduce performance during emergency braking. I recommend promptly visiting a professional 4S dealership for diagnosis, as Mercedes-Benz’s braking system is complex, and DIY attempts might lead to mishandling. During regular maintenance, have the technician inspect the brakes to ensure safe and worry-free driving.
When my Mercedes-Benz C-Class brakes start squeaking, I take a quick look myself. First, I clean the dust between the brake pads and discs, either by blowing it away with an air gun or wiping it off with a damp cloth, which often helps. Then, I check the wear level of the brake pads. If they're thin, it's time to replace them with new parts. You can find OEM-compatible parts online, which are cheaper than buying from a shop. However, don't tamper with critical components, as messing with the wrong screws might damage the wiring. Sometimes, the noise is due to insufficient or aged brake fluid, so trying a fresh fluid change might help. The key is not to delay—address the issue as soon as you hear the noise to prevent minor problems from turning into major, more expensive repairs. I usually clean the dust every few months to avoid a lot of hassle.
