UPDATE: from post 473 -

I got my car back last Wednesday - they addressed all my issues - the radio now works as they replaced the satellite radio control unit - they replaced all brake pads with supposedly new harder pads and added copper paste and brake quiet - they also did a software update for electric power steering control unit to help with the vibration(which I think helped a bit, but more on that in my next post) - they also adjusted the passenger side door strikers to help align the doors and trim - looks better but not perfect - overall I am happy with the service from my dealer.

 

Takehold,
Thanks for the update. Try cleaning your wiper blades with denatured alcohol. Nothing worked for more than 1 week until I tried the denatured alcohol. They've been running smooth for over 3 months now, and that includes light or heavy rain as well as low or high driving speeds.

 

Jetfuture - Thanks for the tip! Probably the only thing I didn't try! I even tried bending the wiper arm a bit where the natural bend is(away from the windshield to reduce the pressure against the glass). That actually helped a little. I will definitely try the denatured alcohol tonight as we have rain/snow coming tomorrow.

 

Hello everyone, I have a 2017 300GLC and have the incredibly noisy brakes on wife's GLC. We have about 5000 miles and live in the cold midwest. So, I contacted my dealer and was given the same line of c--p, "we know of the problem, we apologize and new brake pads are due in about one month". I waited a few weeks and got very tired of hearing my wife back out of our long driveway. So, I called service manager to see when we could get a fix. He still did not have any idea of when so, at this point, I asked to plead to a higher authority. He gave me the 800 number for MB "Customer Care"...ha! I called the number and spoke with a gentleman that politely informed me he had no idea what I was talking about. He knew of no problem with GLC brakes. Really? I asked him to conference in my MB service manager, which he did. I let them stammer around for a bit and asked my service manager to call me.
Service Manager calls me and finally leveled with me, saying, they really don't know what is causing the problem and he doesn't know if the brake pads are the right fix. He suggested I bring my car in so he could put some new pads on and start an official record of my product problem. (This is important if any of you want to pursue a lemon law action down the road).

So, today I got the car back. Oh, and by the way, the loaner car GLC screeched like crazy too! So far, the brakes don't screech. However, I have zero confidence this is the end of it.
On another note, I am not a MB mechanic but I am a degreed Metallurgical Engineer and worked in material design and product failure analysis of heavy construction equipment for many years, now retired. Anyway, I suspect the problem could just as easily be with the brake rotors as with the brake pads. Was there a material change, heat treat change, etc. Something is going wrong with this wear couple to cause the rotors to wear or create grooves that like to
sing when pressed together...just thinking here. I asked my MB Service Manager if they had considered the rotors in root cause analysis and he quickly said that was not the cause, then backed off and said he didn't know.
So friends, I am filing away my service record and will use them to pursue a lemon law settlement if this isn't fixed. I'll update as the story unfolds.

 

Just got my GLC300 back and to correct the SCREECHING brakes they replaced the front brake pads. It required the tech recreate and video for MB to supply the parts. ( Never mind the banchee screaming coming from the front axle when the valet driver picked it up for service.) i.g. Burton Mercedes in Milford DE performed the service. Warranty.

 

Failed to include the part number on my previous post: FP # 000-420-81-00-64 Qty 1 TS Disk Brake

 

For anyone interested in the outcome - the dealer replaced the front brake pads as good will and at least for now the screeching is gone. Initially the dealer said the brake pads are not under warranty but after I expressed displeasure at having to pay for new brake pads so soon they agreed to replace as goodwill. They said it is a known issue.

 

They did the same for my repair. We didn't even speak about break pad costs -- it was done when I picked it up, no charge.

 

For those of you experiencing or have experienced it, can you tell me if it's an 'every time I touch the brakes' thing or only while they're cold and driving in reverse? Or some other scenario?

Trying to narrow down the circumstances. Thanks...

 

For me it was under 35F in reverse when lightly applying brakes - But, once when it was about 5F outside they squealed for a second after putting car in drive and applying the brakes when moving car forward a bit.

 

For me it started in October (so not super cold out) and reversing out of the garage or a driveway, parking spot.

 

started around 4k miles for me or so when the weather hit the low 50's
i usually reverse first thing almost 100% of the time so that's usually when i heard it
with temperatures in the 20's would do it them as well as for a little bit when going forward
in all probably no more than 2-3 seconds of loud noise

 

Mine started in summer---June 2016 at about 4K miles. It was warm and humid. For months it was just the rear brakes screeching, and only when backing up the first drive of the day. Later in winter I could hear some screeching coming from the front brakes and also occassionally when breaking while driving forward. The screeching was incredibly loud!

I had the fix done in March 2017 per LI42.10-P-065628 & LI42.10-P-065058) and the screeching has not returned like it was doing since. Yes, in the coldest days this winter here (temperatures in single digits-teens Fahrenheit), I heard a very short mild squeek when backing up, but nothing like the original problem. Also, I now get brake dust which I did not get with the original brake pads, but I'll take that over the banshee-like screeching. Oh, and I am currently at 16K miles. I THINK that if the problem was going to come back, it would have done so by now.

 

 

 

 

Not unusual for a company to take this tack with an thorny issue. Engineering takes the position, we consider this issue of little consequence, however, it is going to cost big bucks to solve it. So, we'll spin it. If we say it's normal and keep saying the same thing over and over, eventually the problem will be considered normal. This is bs. I've been driving cars with disc brakes since 1966, Not once did I experience brake noise....until my GLC.

When I returned my GLC to M-B service with the noisy brake gripe, the service manager listened patiently, gave me a loaner, called me the next day to tell me they replaced front brake pads, no charge, problem solved.

Noisy brakes on any car - unacceptable, especially an expensive machine such a Benz or Porsche.

 

 

Mine is a 2018 and had the squeal. Look at post 473 above. When your car has about 2-3K miles on it and the temp is under 40F listen for the squeal on reverse. keep us posted - maybe the newer 18s have been fixed before delivery. Mine was made in 7/17.

 

In June I had my rear brake pads and rotors replaced, which I paid for. The squealing continued. In January the dealer replaced the front pads and rotors as a "customer courtesy". I was told Mercedes had changed the material of the pad. The squealing returned almost immediately. It is in the shop again. I was told this morning that there is no fix at present time. Mercedes is aware of the issue and is currently working on a redesign. I am beyond frustrated.

 

What model year is your GLC?

 

 

My brake sqeak so bad it starts to take my focus off the road and I almost rear end another vehicle.

I live in Canada and I have a 2017 GLC300 with AMG nigh package. My break squeak after driving for about 5-10mins and it is loud. I get all the symptoms, squeak in reverse and forward. Dealer has tried to fixed it 3 times and still the same problem.

Should and can we start a class action law suit against MB?

 

I personally feel a brake squeak should be fixable. Whether it needs new rotor, new pin grease....or whatever. A competent tech should be able to pin point to the source of the squeak, the either replace or lubricate.

 

Short of that, you should look into the 'lemon laws' for your particular province. In my state, after 3 attempts to fix it with no remedy, within 2 years, the dealer may be forced to buy it back.