Why does the Mercedes-Benz C-Class make a noise when the brake is pressed once?
2 Answers
The reason why the Mercedes-Benz C-Class makes a noise when the brake is pressed once is due to simple friction between the brake pads and the brake disc. Solution: For C-Class cars, both the brake discs and pads are new, so they need to be worn in. During this period, the brakes may produce abnormal noises, which can be categorized into vibration friction and sharp hissing sounds. However, these noises will disappear after a few hundred kilometers. Solution: During sandstorm weather or in dusty conditions, sand or dust particles may enter between the brake discs and pads, causing a hissing noise when braking. Solution: Brake pads usually have some hard metal shavings at the bottom, which are intentionally placed there. When these shavings are ground, they produce a metallic hissing sound, indicating that the brake pads are almost worn out. At this point, the brake pads should be replaced. Solution: If a clattering noise occurs during sudden braking, accompanied by vibration in the brake pedal, this is due to the activation of the Mercedes-Benz ABS (Anti-lock Braking System) tire function during hard braking. This situation can be ignored.
I've been driving a Mercedes-Benz C-Class for five years and have encountered the issue of squeaking brakes several times. The most common cause is when the brake pads are nearly worn out, and the small warning shim touches the brake disc, making a clicking sound. I remember last winter, after washing the car and leaving it overnight, the brake discs were completely rusty in the morning, and the first brake application was particularly loud. If you've just replaced the brake pads with new ones, this noise may persist for a few hundred kilometers because the new pads and old discs need to re-bed. Don't ignore issues with the brake calipers not retracting properly—my neighbor's car had this problem, leading to brake drag. It's advisable to regularly check the thickness of the brake pads; if they're below 3mm, it's time to replace them. The braking system in Mercedes-Benz is quite sensitive, so any unusual noise should be investigated promptly—safety is no small matter.
