RCC

Hi there

Does anyone elses car 'groan' when braking to a complete stop completely, particularly when cold? It's not something I've experienced with a new vehicle before and I am wondering if I should get MB to take a look. It's a grinding/goraning like noise just as the vehicle stops completely - to be clear, it certainly isn't a squealing noise. I assume it's the brake pad rubbing on the rotor.

It's a brand new GLC300 - the noise feels like the brakes grabbing and it's worse when the vehicle is cold. Occasioanlly you get the noise when lifting off the brake to accelerate as well.

It's been disappointing that the car doesn't come to a smooth (and quiet) complete stop. Have done around 1,500kms now and tried 'bedding' in the pads a couple of times to no avail.

Just wondering if there is any solution to this problem.

Thanks

This isn't my car or video, but this is much the same noise:

You Tube

Plutoe

Id be at the dealership and sitting on the service managers till I get an answer

c3004m

Did you ever get this resolved ? I think my car is doing the same - I have found that if I apply very light pressure to the break pedal it does not happen. Now that I pay attention to this when it does happen it is very annoying - in my case feels like the car wants to roll back even on flat surface. It could be that the electronic breaks or the start/stop system is about to kick in. I will swing by the dealer at some point, but would be nice to know if others had this, just in case they dismiss this as a non-issue

ParjAS

Wouldn't be worried, this is a common problem on the GLC

c3004m

By common you mean the dealer will not do anything about it and call it a feature of the car
If I get any useful dealer info will post it here - also if anyone knows of a good thread on the subject please point me at it - part of the problem is that describing in words the noise that is made by the car is difficult.

ParjAS

Absolutely right c3004m. Strange why it happens in the first place. And its new, thats concerning. It usually happens in around 2 years. Maybe brake fluids low?

c3004m

My thinking was that it might be related to the Hold, Start/Stop or the electronic Parking break features, but will make sure to check the break fluid level just to make sure and eliminate that as a possibility - the car was built in Jan. 2020 in Finland and I picked it up in May - about 3500 Km, most highway as a break in.
Coming from C300 and very much liked that car - wanted to try a SUV ( more and more snow each year ) and it was between this and a Mecan - when I test drove the Mecan I did not like the transmission noises, and here we go, I get my own set of new noises - life.

ParjAS

Absolutely right c3004m. Because of covid, you might have reduced the use of your car and brake fluid levels might be abnormally low.

GateKeeper

My wife complained about the brake groan as well, I took the vehicle hit the highway, hit 120-140km, and hit the brakes hard, come to an almost complete stop, and do it again, I think I did it 7 or 8 times, you want to warm them up real good, make sure no one is behind you, keep it safe...

wife has not complained since.

watch a few good YouTube vids on brake bedding and correct procedure and recommended times, I understand you said you bedded the brakes, I am just hoping it was done properly.

Some are saying low brake fluid levels.
I don’t understand why brake fluid levels would be low, if your losing brake fluid, there is a serious problem in your brake system, this you better get checked by the dealer or a competent mechanic, you should not be losing fluid anywhere....

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c3004m

Thanks for the info - I just checked the fluid level and it is fine. I did break-in the breaks. When I apply very light breaking pressure and come to a stop, no noise, if I apply more force I get the noise as the car is about to stop - it feels like the car is rolling back just a bit, but I suspect it just feels that way. I suspect the noise was there from the start, I just was not paying attention as most of the driving was highway and not many full stops - want to at least understand the issue.