[M2 CCO]

Sounds like warped rotors possibly.

[Ravenseal]

Eeeeeeeeeeeee

[RockCrusher]

Originally Posted by Chicanery

somewhat related.... does anyone else get a slight vibration/shaking of brakes when coming to a complete stop? wondering if its a build-up of brake dust or if the rotor is compromised.. which would be odd since it's only got 2300 miles on it....

Not sure how dust build up could account for the symptom.

Warped rotors is often blamed and it might be true in your car's case but I would not accept this diagnosis without seeing the results of a brake disc run out measurement with one or more discs manifesting out of spec axial or radial run out.

There can be another explanation.

No sign of this with my M2 but years ago this behavior appeared with another car. A VW Golf TDi.

I had washed the car a few days before and left it parked on the driveway wet. Not surprisingly the brake rotors developed some rust. Parking brakes, too. The car moved away from rest with a loud pop as the rusted emergency brake hardware broke free.

Got in and drove the car to a main road and at no time until then had I used the brakes. Then I had to make an emergency stop when another vehicle ran a red light. An emergency stop and I left the brake pedal applied for a bit.

Afterwards there was a slight pulsing when during light braking. Tried another bedding in process, tried sanding the rotor braking surfaces with a coarse grit emery cloth. Nothing helped. I was faced with either have the (nearly) new rotors resurfaced or replaced.

But I found by accident a work around. I just avoided real light braking. I was I suppose fortunate that it didn't require that much more aggressive braking to avoid the pulsing.

So I drove on. And on. And on. Then at around 150K miles I sold the car. With the original brakes. During the test drive the buyer (a woman) used gentle braking as is the norm with most drivers and she noticed the pulsing. I had forgotten about it. I adjusted my price down a bit for the brakes and she bought the car.

But I learned a lesson. Since then I always drive the car after a washing and use the brakes hard enough to get them hot completely dry. Make that two lessons. If a car has sat out in the rain and the rotors have developed a bit of rust to make it a point to use the brakes without bringing the car to a stop to remove the rust so if a hard braking with a stop is required there is less chance afterwards of the brakes manifesting that pulsing.

[Chicanery]

So I got word back from dealership... It is suspension related. The compromised part is a crank dampener, has to be ordered from Germany, going to take 2 weeks. Only got 2k miles on this thing. Quite surprised.

[Squidget]

Originally Posted by Chicanery

So I got word back from dealership... It is suspension related. The compromised part is a crank dampener, has to be ordered from Germany, going to take 2 weeks. Only got 2k miles on this thing. Quite surprised.

What the heck is a crank dampener?

I know what a crank damper (aka harmonic damper) is, but that's crankshaft, not suspension.

[cmgbk75]

Originally Posted by Squidget

What the heck is a crank dampener?

I know what a crank damper (aka harmonic damper) is, but that's crankshaft, not suspension.

[Chicanery]

Lol dude I know. That's literally what my advisor texted me.. she ain't the best.

Got update from someone more knowledgeable at dealership service dept.. it's not suspension, it's engine related. Doesn't seem good. Crankshaft issues with such low mileage and easy driving. Possible lemon?

[Squidget]

Originally Posted by Chicanery

Lol dude I know. That's literally what my advisor texted me.. she ain't the best.

Got update from someone more knowledgeable at dealership service dept.. it's not suspension, it's engine related. Doesn't seem good. Crankshaft issues with such low mileage and easy driving. Possible lemon?

Sometimes there are manufacturing defects, but that's what warranties are for.

Most lemon laws require multiple failures before they can be invoked. IANAL of course.

If it's just a bad crank damper, they can replace it, and you get a perfectly fine car back. Assuming they aren't idiots. If they are idiots, well, anything can happen, of course.

[RockCrusher]

Originally Posted by Chicanery

So I got word back from dealership... It is suspension related. The compromised part is a crank dampener, has to be ordered from Germany, going to take 2 weeks. Only got 2k miles on this thing. Quite surprised.

Well, that's certainly a diagnosis I didn't expect.

Don't think the tech just threw a dart at the problem board and hit crank dampener though.

With more consideration it is not as far fetched as it might first appear.

You did mention vibration/shaking.

If the crank dampener is the problem the engine can manifest vibration and even shaking which could be assumed to come the brakes. And understandably so.

One possible way to confirm it is the crankshaft dampener is with a strobe light on the thing while the engine is running to look for any signs of a wobble. At idle or as engine RPMs are raised and then allowed to return to idle speed, such as what occurs when slowing for a stop.

Have to mention FWIW crankshaft dampener failure has appeared on other car forum brands far more often than I can ever recall before. It appears that post COVID quality problems have gone from water pumps, fuel pumps (my 2020 M-B cargo van had two low pressure fuel pumps go bad just 5K miles apart) to crankshaft dampeners.

[rangerfan94]

OMG the brake squeal is almost unbearable on this car. Seriously, it's that bad that I have considered dumping this car. Someone, please talk me off the ledge....

[RockCrusher]

Originally Posted by rangerfan94

OMG the brake squeal is almost unbearable on this car. Seriously, it's that bad that I have considered dumping this car. Someone, please talk me off the ledge....

Assuming the noise is not hardware related I have had good luck eliminating brake squeal with first washing the brakes doing this at DIY car wash and a wash nozzle. If one uses rinse the water runs black with brake dust.

After a good washing then taking the car on a drive and driving upon a road that lets me treat the brakes to a brake bedding in procedure. This involves accelerating the car up to some (legal) speed and applying the brakes moderately hard and slowing the car say from 70mph to ~50mph. Then quickly accelerating up to speed again and repeating the braking process. I do this a 3rd time. This gets the brakes hot and ensures they are dry but it also removes a bit of glazing that develops from dirty brake hardware and specifically the piston dust boots which interferes with the brake pistons' natural tendency to retract slightly when the brake pedal is released. If even one pad doesn't retract it will rub -- lightly -- against the rotor and both the pad and rotor will develop a mild glazing.

I have done the above with a number of my cars (and one M-B cargo van) prior to my M2. A clue it needs doing is if at low speed in a parking lot I hear a faint squeak from the brakes. Or when slowly coming to a stop hearing brake squeal.

You don't even have to wash the brakes just do a brake bedding in procedure like I described above. But if it helps a brake washing will keep the squeal at bay for longer.

[Chet for short]

Originally Posted by rangerfan94

OMG the brake squeal is almost unbearable on this car. Seriously, it's that bad that I have considered dumping this car. Someone, please talk me off the ledge....

Also try the bedding procedure. 70+ mph to like 10 mph hard braking 5 times in a row, then let them cool. This helped mine immensely. I still have just a little squeak though.

[MELLOWYELLOW06]

Welcome to the club.

20k miles and squealing strong for 500 miles, on my M8!!!

Nothing can and will be done.

Ben at r33_RGSport has some pads that take care of it thogh.

[r33_RGSport]

Originally Posted by MELLOWYELLOW06

Welcome to the club.

20k miles and squealing strong for 500 miles, on my M8!!!

Nothing can and will be done.

Ben at r33_RGSport has some pads that take care of it thogh.

[6empty]

Considering the new M2, but came here after remembering how much the brake squeak drove me insane on my 2020 M5. It was ultimately the reason I sold it. I tried everything to eliminate the squealing brakes - hard braking runs, reverse braking runs, washing brakes, seeing dealer - nothing helped. The ~$100k car sounded awful and completely ruined the experience for me. I had a 2015 M3 and I don’t recall the squeaking. So maybe there is hope?

Like others have said, I view this as a design flaw and don’t buy the “it’s just what high performance brakes do” argument. It’s unacceptable. I’d prefer worse brake performance with no squeal 100%.

So, before I get too excited about this M2 (and it may be too late), does anyone here have a proven solution for the expected squeaky brake issue? Are there aftermarket replacement pads that have proven to be quiet? I’m reluctant to believe that the hard braking runs fixes the issue after my M5 saga (it didn’t work for more than a few miles).

Would love to hear there is a solution if such a solution exists?

[stashstein]

One thing this has made me realize is that the sound insulation on this car is insane. I never hear that squeal unless my windows are down and then it's loud af.

Windows up, can't hear it at all so I don't reallly care about it 🤷🏻‍♂️

[r33_RGSport]

Originally Posted by 6empty

Considering the new M2, but came here after remembering how much the brake squeak drove me insane on my 2020 M5. It was ultimately the reason I sold it. I tried everything to eliminate the squealing brakes - hard braking runs, reverse braking runs, washing brakes, seeing dealer - nothing helped. The ~$100k car sounded awful and completely ruined the experience for me. I had a 2015 M3 and I don’t recall the squeaking. So maybe there is hope?

Like others have said, I view this as a design flaw and don’t buy the “it’s just what high performance brakes do” argument. It’s unacceptable. I’d prefer worse brake performance with no squeal 100%.

So, before I get too excited about this M2 (and it may be too late), does anyone here have a proven solution for the expected squeaky brake issue? Are there aftermarket replacement pads that have proven to be quiet? I’m reluctant to believe that the hard braking runs fixes the issue after my M5 saga (it didn’t work for more than a few miles).

Would love to hear there is a solution if such a solution exists?

Should’ve bought my iSweep pads for your F90 and you wouldn’t hate it.
Luckily, I also have iSweep brake pad for G87 M2.

[Hypori]

I swapped the pads to EBC reds. Cheap and seems to do the job well enough.

[RockCrusher]

Originally Posted by Chicanery

Lol dude I know. That's literally what my advisor texted me.. she ain't the best.

Got update from someone more knowledgeable at dealership service dept.. it's not suspension, it's engine related. Doesn't seem good. Crankshaft issues with such low mileage and easy driving. Possible lemon?

Did your car get a new crankshaft dampener?
.
I ask because YouTube suggested a video to me and it was about a YouTuber with a new M2 with some pretty severe vibration during the latter stage of a stop. There was no vibration when slowing at high speed which is what happens with "warped" rotors.

At any rate and long story short BMW initially refused to look at the car because of some rather minor mods. He undid these and the video ended with a meeting with someone at the dealer about to happen. He didn't want to film the meeting.

The M2 owner believes the problem is brake related and based on what I could see/hear from the video I'd have to agree. From someone he heard some cars sit so long at the port after arriving the brakes rust up and this is at the root cause of the shuddering during the latter stage of stopping the car.

I have encountered some very mild vibration as a result of bringing a car to an emergency stop so this is not implausible.

Let me post a link to the video and you can watch it -- if you haven't already seen it -- and maybe gain some valuable info.

[Chet for short]

Originally Posted by Hypori

I swapped the pads to EBC reds. Cheap and seems to do the job well enough.

Where did you get them? The rears are backordered at ECS, have been for over a month.

[Hypori]

Originally Posted by Chet for short

Where did you get them? The rears are backordered at ECS, have been for over a month.

Got them from CSP Racing. They arrived 3 days after order was placed. That was in June though.

[Ratcher]

Originally Posted by 6empty

Considering the new M2, but came here after remembering how much the brake squeak drove me insane on my 2020 M5. It was ultimately the reason I sold it. I tried everything to eliminate the squealing brakes - hard braking runs, reverse braking runs, washing brakes, seeing dealer - nothing helped. The ~$100k car sounded awful and completely ruined the experience for me. I had a 2015 M3 and I don’t recall the squeaking. So maybe there is hope?

Like others have said, I view this as a design flaw and don’t buy the “it’s just what high performance brakes do” argument. It’s unacceptable. I’d prefer worse brake performance with no squeal 100%.

So, before I get too excited about this M2 (and it may be too late), does anyone here have a proven solution for the expected squeaky brake issue? Are there aftermarket replacement pads that have proven to be quiet? I’m reluctant to believe that the hard braking runs fixes the issue after my M5 saga (it didn’t work for more than a few miles).

Would love to hear there is a solution if such a solution exists?

Buy an M240i.