The 2021 Mercedes GLC 300 is a popular luxury SUV, known for its blend of performance and comfort. However, some owners have reported experiencing a notable brake noise issue, specifically a pronounced squeal. This isn’t a subtle squeak but rather a distinct, sometimes loud, squeal that can be quite concerning and noticeable, even at low speeds. Unlike typical minor brake noises, this issue can be prominent enough to be heard from a distance, causing considerable frustration for drivers.
This brake squeal often emerges after the vehicle has been driven for a few thousand miles, typically starting anywhere between 4,000 to 10,000 miles. Interestingly, the onset of this noise seems to correlate with seasonal changes, with many owners noticing it for the first time during the colder winter months. This suggests that temperature fluctuations or environmental factors might play a role in the occurrence of the squeal.
For some owners, the problem may initially appear after about six months of ownership, coinciding with the arrival of colder weather. Experiences with earlier GLC models, such as the 2016 version, indicate that this issue isn’t entirely new. In those cases, service bulletins were issued to address the problem, involving parts replacement and specific service procedures. However, even after these interventions, the squeal sometimes returned, indicating a potentially recurring or complex issue. Furthermore, the noise isn’t always limited to reverse maneuvers; it can also manifest when moving forward, particularly at low speeds, like when navigating parking lots.
The prevalence of this brake squeal suggests it’s not an isolated incident, potentially affecting a significant number of 2021 Mercedes GLC 300 vehicles. While dealerships may initially downplay the issue, it’s been reported that even loaner vehicles can eventually develop the same problem, highlighting the widespread nature of this concern. If you are experiencing a brake squeal with your 2021 Mercedes GLC 300, it’s crucial to document the issue, note when it occurs, and seek service to address this potentially widespread problem.
