Is anyone having brake issues? I have encountered an issue where they squeal horribly when braking from any speed all the time. Started around 8500-9000 miles and isn't getting better. Also have had them over react when barely engaging the brake and have had it go full brick mode and the brakes failed and the emergency system kicked in to stop it. Dealer states that they can't fix it and I have been to 2 different dealers at this point. Finally fussed enough that they are replacing the brakes completely and changing some other components. I have been having to go weekly to have different things fixed (OS glitching, speakers buzzing, transmission kicking from 5>4, etc.) and I'm < 10k miles. I have the regular non ceramic brakes btw. Any advice is appreciated.

 

We've had 63 since early November, but still only 2,500 miles. (Pandemic!) No squeal. But had the brakes over react since the beginning. It doesn't always happen, but when it does: I'm slowing down at a stop sign - then they grab. It's very jarring! I'm taking it in for that and several other issues.

 

What other issues are you seeing? We have one on order, and I’m having second thoughts after reading about all these issues.

 

Guys,
I also have one on preorder and it’s being delivered in July. Are you implying that the new GLS63 has inherent issues or it’s just the brakes?

They also started offering Carbon Ceramic brakes from this year. Should we opt for that?

 

I see many of the posts tell about the myriad of problems. I haven't found that to be true.
My brakes grabbing is not a show stopper - you just have to be careful.
I have a steering wheel that clicks when you turn it - it'll be fixed soon.
That's it.
Nothing serious.
I love the vehicle.

We've had two GL63s.
One GLS63 - last generation.
Now this new GLS63 of the new generation.
This new generation is great!

 

Thanks Bob.

They came up with Carbon Ceramic brakes this year. Do you think I should opt for that?

Also, talking about old and new GLS63, how different is the new one in terms of driving and overall ownership experience?

 

Ceramic breaks:
I decided against ceramic. I've had them in the past: they squeal and have a tendency to grab.
On the positive side: almost no brake dust!!!
Our last 3 GL/GLS63s all ate (none ceramic) brakes! Particularly in the rear. Ceramics last WAY longer; but are ungodly expensive to replace!

New verses old:
The 48V system makes a difference. There is no low end hesitation in acceleration.
It also results in better gas mileage... maybe 2 mpg.

I like that you can lower the second row seats without having to move the front seats forward.
Better leg room in second row.
So, bigger IS better!

I have 22" tires. No all weather tires in stock size.
So I went with Pirelli Zero All Season 285/40R22 and 325/35R22.
Other treads about pros and cons...
I found them great in snow this winter.
They are quiet, smooth riding.

Ultimately, I'm a tech-nerd.
The larger screens and technology are great.
The remote software to Mercedes Me Connect is fantastic.

We just really like the new car.
It's not a world of difference from the last GLS63, but there's enough difference that it was worth the upgrade.
It's comfortable.
It's crazy powerful.

 

Thanks a lot Bob for your valuable feedback. I am tech nerd too and I am so excited for this car to finally come in July.
I am thinking if Ceramics squeal for couple of miles and then are fine, may be I can opt for those as they could go over 50K miles for me as I drive kinda sensibly. Wonder if grab issue is no-go enough for me to not consider it. Whats your suggestion in terms of replacement cost? If I don't have to change my brakes for 50k miles, is this good enough reason to go for it?
(I am also thinking that may be CC brakes will be slightly common by then in the next 3-4 years would be relatively/slightly cheaper too

You're saying that factory 22'' don't come with all season?

Appreciate your comments.

 

Tires:
The GLS63 with 22" wheels only comes with summer performance tires. No option.

Ceramic Brakes:
Had ceramics on a SLS. Squeal never went away.

Brake duration:
It is only on the GL/GLS where I had problems.
I had a S550 that went 53k before new brakes.
My current 2017 CLS63 has 51k - no new brakes yet.

I was worried about the duration of the ceramics on the 2021 GLS63.
Ceramics can last anywhere from 30-100k.
On GLS - who knows?
There is no experience!
So I decided not to take the chance.

 

My old 2017 GLS63 is sitting in my garage next to my 2021, so I have noticed 65 changes from the old to the new. I’ll post about it soon in a new thread. Definitely worth it. No issues so far after 3,000 miles except an occasional ultrasonic warning error.

 

Hey guys sorry for dropping off the map there, life has been a little crazy. They’re swapping out the whole system today so I’ll let you know how it goes. This is attempt 3 to fix the system between squealing, over/under braking so I’m hoping this fixes it. There are some other issues I’ll have them address today if they can but I’m seriously tired of taking it in as I live nowhere near a dealer.

 

No! Ceramics are for track use in road use they may actually be worse than steel since they need to be hot for best performance. Replacement costs are incredible and by the time you need to replace them, they may cost more than the care itself! Another rare problem is that they tend not do wear out, when they fail they crack and fail completely thus taking the rest of the brake with them. ERGO, unless you are going to be tracking your GLS on a regular basis (no one does) avoid them.

 

Update to anyone who was following: Mercedes has told me they are keeping the car for 3 days for a tech to use/test constantly regarding the issues. I’ve had numerous problems with mine and today they finally admitted that much of what I have experienced is known/reported already; just not normally all of the issues existing in a single car. I’m now out of my amg until next week (because of my work schedule) at which point I don’t expect it to be fixed given the terrible experience I’ve had with service so far. Going to reach out to corporate today but looks like I’ll be pursuing lemon law at this point. It looks like others have had normal cars and it truly feels like mine has virtually every reportable issue. So far I have experienced brake system failing (failing to stop with the pedal completely depressed), over braking where it goes full panic stop when just barely depressing the pedal without other cars around, stereo blaring static when getting in the vehicle without starting (like knock out your hearing loud), OS failed and dropped out while driving, perimeter sensors going haywire when stopping (blaring and showing red around the vehicle without anything near it), speakers on passenger side having some high pitched tinny noise on/off (the upgraded 3D Burmester), shifting from 5th->4th makes a very physical jolting shove (did this for 3k miles), fuel latch gets stuck and can’t open at all. I’m sure there are some things I’m forgetting to include here but before yesterday the dealers I had brought it up to have just tried to brush off my concerns as not a big deal or it just is that way and it doesn’t need to be fixed. It’s really concerning given I drive a lot for work and I’m afraid about being stranded somewhere and/or getting in a serious wreck which had nearly happened with the brake issues. I’ll keep everyone updated who is interested in what happens from here.