Mercedes-Benz GLC 300 grinding brakes problems

Filed Aug 28, 2025 · Driver assistance, Electrical · 2,000 miles · NJ

The contact owns a 2025 Mercedes-Benz GLC300. The contact stated that while driving approximately 30 MPH, there was an abnormal grinding sound coming from the vehicle. The contact stated that the brake assist suddenly activated and the vehicle came to an abrupt stop, causing the seat belt to immediately retract and lock. The contact was slightly jerked from the abrupt stop. The contact stated that a warning light with a red triangle with an image of a crash in the center was illuminated. The contact stated that after starting the vehicle, the infotainment center and the instrument panel were completely black. The vehicle was restarted several times before both systems started operating as needed. The failure occurred twice; however, the second time, the contact had to turn off and restart the vehicle for approximately an hour before the infotainment center and instrument panel became operational. The vehicle was taken to the dealer, who performed a software update for the infotainment center. After the software update was completed, the contact became aware there were other electrical systems that failed intermittently, including the voice activation system. The vehicle was returned to the dealer and the contact was informed that the front driver’s and passenger’s sides sensors were too low and there was no reason for the notification to become activated. The vehicle was not diagnosed or repaired. The manufacturer was informed of the failure, and a case was opened. The failure mileage was approximately 2,000.

Filed Jun 18, 2025 · Visibility · 82,000 miles · GA

The contact owns a 2017 Mercedes-Benz GLC300. The contact stated that on several occasions while opening the sunroof, the contact heard an abnormal grinding sound. Additionally, the contact stated that the sunroof failed to close as intended. The vehicle was taken to a dealer where it was diagnosed and determined that the sunroof rails needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 82,000.

Filed Dec 29, 2023 · Brakes · CA

I have had issues with squeaky, very loud noises at slow speed and reverse braking. I have had this issue since I purchased this vehicle. I have brought it in a few times to have 2 different dealers fix the noise as I believe it is a safety issue as well. They said this is a common issue with GLC that they have noises while braking but there is no fix. I had an advisor drive the vehicle and witness loud squeaky noises while braking. Spending a lot of money on this vehicle, and Mercedes should fix this issue. I believe the brake system falls under lemon law and Mercedes should do something to mitigate the issue. The brake pads were okay upon inspection, but pretty soon I will have to pay a lot of money to replace pads at my own expense when the brakes, pads, rotors, etc themselves should be replaced and fixed at Mercedes expense.

Filed Apr 9, 2023 · Steering, Suspension · NC

There is a squeaky noise from the suspension, shock absorbers or somewhere in that area. They have fixed the issue multiple times. Kept my car in the workshop for days multiple times but it’s not getting fixed. They probably sold me a lemon. I need help in rectifying this issue.

Filed Jan 30, 2023 · Brakes, Fuel system · IA

Raw fuel smell when vehicle is at idle. Breaks are very loud at low temperatures. Very squeaky like metal on metal yet the brakes are like new from Mercedes dealership.

Filed Mar 7, 2022 · Brakes · TX

Continuous problem with brakes squealing very loud. Have had brake pads replaced and taken to dealership multiple times to no resolution. It is a huge problem with how loud it is not to mention unsafe and making me feel uneasy about them giving out at any time. This is ongoing from several years ago

Filed Nov 15, 2019 · Airbags, Driver assistance · 50,000 miles · IN

I purchased this mercedes new in 2016, the brakes have squealed ever since when cold 32 degrees or less.. Once in awhile when warm. 2 we smelled gasoline, we took it to a repair shop, they found two fuel hoses sprayed gas in a mist especially when cold.. 3 there are 3 recalls open on this mercedes, I took it in when the air bag recall arrived at our house, I was told we don't have parts. Our car is out of warranty, it has 56000 miles. I take it to a repair shop run by certified mercedes technicians. Thank god we didn't have a fire with the gas leak. I did smell the gas when moving thru the ventilation system and when sitting and the smell was all around the car.

Filed Feb 10, 2019 · Brakes · 6,780 miles · IL

When braking, the brakes make a grinding noise. This happens any time you apply the brakes when I am backing out of the garage of my home and when I stop at stop signs and stop lights and when traffic is at a stand still on the main thoroughfare. The noise will eventually cease depending on how often the brakes are applied. This is an ongoing issue that started in august, 2018 and continues as of february 10, 2019.

Filed Dec 22, 2018 · Brakes · 7,500 miles · ID

Bought car 3 days ago and brakes squeal upon backing out of garage and sometimes applying when stopping! Specifically asked salesman if mercedes had problems with brakes making noise as we went through this with a vw toureg and was told no they do not have this problem. Called salesperson today and was informed now that they are aware of this issue and its normal and should only happen when car has been sitting and its cold or they got wet. Told if it goes more times than that bring into service???? Very disappointed we were bold factly lied to and now have another car that appears to have brake noise issues.

Filed Dec 9, 2018 · Brakes · 2,500 miles · AE

The brakes squeal very loud and I am constantly having to brake hard several times to make this noise temporarily go away. I have taken it to mercedes and they say that this is not under warranty. I took the SUV once early on after the car was purchased. The dealer told me to brake hard a few times and this would go away. It didn't I took the car three times to the dealer until finally they replaced the rear brake pads but tried to charge me for it. The brakes continued to squeal. I took it to and independent garage to have the pads replaced at my own expense since mercedes doesn't know how to fix the problem. Now the brakes are still squealing and are very annoying. If I do not get this fixed, I'll never buy another mercedes. This only happens when moving and brakes are usually cold but sometimes it squeals regardless if it is cold or not. Very annoying problem.