What are the causes of brake noise in the e300l?
3 Answers
e300l brake noise is caused by: 1. The surface of the brake pads aging or sharp edges; 2. Severe wear of the brake pads; 3. Deformation or rusting of the brake discs. Taking the 2021 Mercedes-Benz e300l as an example, it belongs to the mid-to-large-sized car category, with body dimensions of: length 5078mm, width 1860mm, height 1484mm, wheelbase 3079mm, and a fuel tank capacity of 66l. The 2021 Mercedes-Benz e300l features a multi-link independent suspension in the front and a multi-link independent suspension in the rear. It is equipped with a 2.0l turbocharged engine, delivering a maximum horsepower of 258ps, a maximum power of 190kw, and a maximum torque of 370nm, paired with a 9-speed automatic manual transmission.
I've run an auto repair shop for over a decade and handled numerous cases of brake noise issues with Mercedes-Benz E300L models. The problem mostly stems from brake pads being too thin or completely worn out. When replacing pads, always check if the brake discs are even, otherwise the new ones will squeak too. After rain, rust on brake discs or small stones getting stuck can cause noise - washing the car or driving a few rounds usually solves it. Lack of lubrication or seized guide pins can be fixed with regular greasing. New cars or recently replaced components may need several hundred kilometers of break-in period - temporary squeaking is normal, but prolonged noise requires checking installation. Avoid hard braking habits that accelerate wear. For safety, check pad thickness every six months - simple maintenance can prevent major issues.
Last month, the E300L I was driving started making a hissing noise when braking, which was quite frightening. Upon inspection, the brake pads were found to be worn down to a very thin layer, and the mechanic warned that delaying replacement could affect braking performance. Even after replacing the pads, the noise persisted, and it was discovered that the brake discs were slightly uneven and needed resurfacing. In cold weather, different rates of metal expansion can also cause a few creaking sounds, though this is usually not serious. Debris entering the brake system or stiff guide pins can easily cause noise as well. It's recommended to visit a professional shop as soon as you hear any unusual sounds. Avoid slamming on the brakes in daily driving to reduce unnecessary wear—this is no small matter, as it concerns life safety.
