The M2 and the 'soda can crunch noise' issue: compilation of some experiences

Hegge · 12-28-2016, 07:31 AM

Is this soda can crunch noise on every M2? This could be a deal breaker as this should not happen on a $60,000 car.

David1 · 12-28-2016, 08:50 AM

Quote:

Originally Posted by Hegge

Is this soda can crunch noise on every M2? This could be a deal breaker as this should not happen on a $60,000 car.

M3 and M4 also.

CosmosMpower · 12-28-2016, 11:39 AM

My car isn't in the diff recall batch but heard the crunch noise twice in 1200 miles, the dealer checked and said it was the parking brake that needed adjustment.

nopslide · 12-28-2016, 04:04 PM

I know we mostly don't care about this because the car is so awesome but I went in for break-in service today at BMW Austin and mentioned it to the SA. He said they knew about it and there's a replacement shield but its on order from Germany. Told me about a month or so out. Gonna ring me up when its in. Other ATX M2 folks might wanna call and make sure they're getting multiple.

Also there's no way the post break-in feel is all placebo. The car pulled way harder even just on my way home. I wish I had ECU instrumented before and after to prove it. Butt Dyno is all I have.

David1 · 12-28-2016, 04:56 PM

Quote:

Originally Posted by nopslide

I know we mostly don't care about this because the car is so awesome but I went in for break-in service today at BMW Austin and mentioned it to the SA. He said they knew about it and there's a replacement shield but its on order from Germany. Told me about a month or so out. Gonna ring me up when its in. Other ATX M2 folks might wanna call and make sure they're getting multiple.

Also there's no way the post break-in feel is all placebo. The car pulled way harder even just on my way home. I wish I had ECU instrumented before and after to prove it. Butt Dyno is all I have.

There is no updated shield. They all have the updated shields that came out a while back for the M3/4. All production has the updated brake shields. The only real fix is to remove the shield completely but that creates its own issues.

QLAbot · 12-30-2016, 07:34 PM

Quote:

Originally Posted by CosmosMpower

My car isn't in the diff recall batch but heard the crunch noise twice in 1200 miles, the dealer checked and said it was the parking brake that needed adjustment.

Parking brake?!

Sounds like a crock of

I hear the noise all the time, and I'm just at 1700 miles. Sometimes its not as noticeable, while other times everyone in the parking lot hits the deck or runs to the nearest bunker!

DelGriffith · 01-11-2017, 02:00 PM

Quote:

Originally Posted by David1

There is no updated shield. They all have the updated shields that came out a while back for the M3/4. All production has the updated brake shields. The only real fix is to remove the shield completely but that creates its own issues.

Bump this-

Any solution to this problem yet? I have 1/4 mile of small gravel to drive to my house, and I heard the noise 6 times in succession today while driving slow in my office parking lot. LOUD and embarrasing

Is it possible to pry the shield away from the disc at the bottom? Anyone find a fix yet???

RPM2-85 · 01-11-2017, 02:19 PM

Quote:

Originally Posted by DelGriffith

Bump this-

Any solution to this problem yet? I have 1/4 mile of small gravel to drive to my house, and I heard the noise 6 times in succession today while driving slow in my office parking lot. LOUD and embarrasing

Is it possible to pry the shield away from the disc at the bottom? Anyone find a fix yet???

GO TO YOUR DEALER AND ASK FOR MESH GUARDS!!!!!!!!!!

This issue is so easily taken care of.

DelGriffith · 01-11-2017, 02:53 PM

Quote:

Originally Posted by RPM2-85

GO TO YOUR DEALER AND ASK FOR MESH GUARDS!!!!!!!!!!

This issue is so easily taken care of.

Sorry RPM,
the mesh guards were only mentioned in a few posts in November, which I missed. I'm surprised that this thread has gone on so long as the fix is so simple. Will check with dealer today. Thanks

RPM2-85 · 01-11-2017, 02:56 PM

Yes should be easy fix. It was for me, dealer had issues with M3/4 with the same thing and same solution.

DETRoadster · 01-11-2017, 03:02 PM

Quote:

Originally Posted by RPM2-85

GO TO YOUR DEALER AND ASK FOR MESH GUARDS!!!!!!!!!!

This issue is so easily taken care of.

Anyone have a part number for the guards? My 1200 mile service is scheduled for Monday. Would like to get that added to the work order.

David1 · 01-11-2017, 03:54 PM

Quote:

Originally Posted by DETRoadster

Anyone have a part number for the guards? My 1200 mile service is scheduled for Monday. Would like to get that added to the work order.

Talked to my dealer about it. No such thing for them to order. Sound like something goofy the dealer did or made themselves.

QM · 01-11-2017, 04:03 PM

Quote:

Originally Posted by David1

Quote:

Originally Posted by DETRoadster

Anyone have a part number for the guards? My 1200 mile service is scheduled for Monday. Would like to get that added to the work order.

Talked to my dealer about it. No such thing for them to order. Sound like something goofy the dealer did or made themselves.

That's what my dealer said as well when I mentioned the mesh guards.

DelGriffith · 01-12-2017, 02:45 PM

Quote:

Originally Posted by RPM2-85

Yes should be easy fix. It was for me, dealer had issues with M3/4 with the same thing and same solution.

Any luck on part numbers? My dealer is completely in the dark on this.
Thanks

David1 · 01-12-2017, 03:45 PM

Quote:

Originally Posted by DelGriffith

Any luck on part numbers? My dealer is completely in the dark on this.
Thanks

There are none. The dealer that did it used epoxy to hold the mesh on if remember the thread. Probably went to the hardware store, got some mesh and did a great hack job attaching it.

anurak · 01-13-2017, 11:33 AM

Today I just heard the "soda can crunch noise" today for 3 times within 5 minutes. Mine is MY2017, and I've been using it for 4,500 km. But I always drive on a good road

Today, the noise appear when I run over some small stones which is left on the road. After that I heard the sound 3 times straight during slow speed. After I drove it for another 5km, the sound disappeared. My guess is same as you guys now which is the stone that making the noise.

BUT! after I got home, I check my wheels and these scratches appear in my both rear wheels. Both on the front don't have any scratches (I still don't know why.)

So it really make sense that those rocks I ran over cause the noise, and maybe the cause of these scratch. But i'm wondering how could the rocks goes inside so easily, why other Models like F30 don't have this kind of problem?

David1 · 01-13-2017, 11:56 AM

Those marks are normal and not from stones.

nd2002 · 01-13-2017, 01:27 PM

Quote:

Originally Posted by anurak

Today I just heard the "soda can crunch noise" today for 3 times within 5 minutes. Mine is MY2017, and I've been using it for 4,500 km. But I always drive on a good road

Today, the noise appear when I run over some small stones which is left on the road. After that I heard the sound 3 times straight during slow speed. After I drove it for another 5km, the sound disappeared. My guess is same as you guys now which is the stone that making the noise.

BUT! after I got home, I check my wheels and these scratches appear in my both rear wheels. Both on the front don't have any scratches (I still don't know why.)

So it really make sense that those rocks I ran over cause the noise, and maybe the cause of these scratch. But i'm wondering how could the rocks goes inside so easily, why other Models like F30 don't have this kind of problem?

Those are your brake rotor hats, not part of the wheels... Wouldn't worry about it.

DETRoadster · 01-13-2017, 02:59 PM

Quote:

Originally Posted by David1

There are none. The dealer that did it used epoxy to hold the mesh on if remember the thread. Probably went to the hardware store, got some mesh and did a great hack job attaching it.

Bummer. Well, the car goes in on Monday. I've already alerted the Service Adviser we we will see what they have to say. Maybe I'll get one of those really creative BS explanations that others on the forum have gotten. "uh, oh, yeah, we found the issue. A pack of squirrels was nesting in your muffler. The sound you heard was them fighting over an acorn. Don't worry, we fixed it."

mofomat · 01-13-2017, 05:07 PM

I have an August production M2, delivered in September last year. I've had these noises sporadically since about 500 miles. Today though was a new experience. I was at low speed turning right onto a roundabout, maybe 15 mph. At the same time as the noise was emitted, the rear of the car jolted as if I'd ridden over a kerb. I looked in my rear view mirror to see what I'd driven over and there was nothing there. It has never jolted before. This is getting very disconcerting, and I'm going to contact my dealer tomorrow.

Has this happened to anybody else?

Johnsonuspp · 01-15-2017, 01:05 AM

It's happening to me I also have an 2016 August build. The noise is coming from the right rear. Took it to the dealer immediately and he said it was rocks, it's really loud but intermittent so of course it didn't do it when they test drove it. I haven't experienced a shudder yet but I only have 3600miles on the odometer. I hope a resolution can be found or someone getting to what's really causing the noise.

Doji desu · 01-15-2017, 04:59 AM

I've had the rear 'jolt' quite a few times but mine was a direct correlation to right foot movement.

Still the odd noise from the backing plates. Still frustrating and annoying. If you can reverse when you hear the noise the stones seem to clear quickly. Not a good solution in traffic though.

12-28-2016, 07:31 AM	#155
Hegge Banned 880 Rep 790 Posts Drives: 2020 BMW M2 CS Join Date: May 2015 Location: PA iTrader: (0)	Is this soda can crunch noise on every M2? This could be a deal breaker as this should not happen on a $60,000 car.
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12-28-2016, 11:39 AM	#157
CosmosMpower Brigadier General 2051 Rep 3,714 Posts Drives: F87c, GT3, MK7 GTI Join Date: Apr 2011 Location: Frisco, TX iTrader: (1)	My car isn't in the diff recall batch but heard the crunch noise twice in 1200 miles, the dealer checked and said it was the parking brake that needed adjustment.
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12-28-2016, 04:04 PM	#158
nopslide Private First Class 87 Rep 139 Posts Drives: M2 Join Date: Jun 2016 Location: Austin, Texas iTrader: (0)	I know we mostly don't care about this because the car is so awesome but I went in for break-in service today at BMW Austin and mentioned it to the SA. He said they knew about it and there's a replacement shield but its on order from Germany. Told me about a month or so out. Gonna ring me up when its in. Other ATX M2 folks might wanna call and make sure they're getting multiple. Also there's no way the post break-in feel is all placebo. The car pulled way harder even just on my way home. I wish I had ECU instrumented before and after to prove it. Butt Dyno is all I have. __________________ 2017 M2 Order Process (Complete)
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01-11-2017, 02:56 PM	#164
RPM2-85 Second Lieutenant 271 Rep 208 Posts Drives: 2017 M2 AW Join Date: Oct 2016 Location: NJ iTrader: (0)	Yes should be easy fix. It was for me, dealer had issues with M3/4 with the same thing and same solution.
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01-13-2017, 11:33 AM	#170
anurak Private 20 Rep 56 Posts Drives: M4 CS Join Date: Nov 2015 Location: Thailand iTrader: (0)	Today I just heard the "soda can crunch noise" today for 3 times within 5 minutes. Mine is MY2017, and I've been using it for 4,500 km. But I always drive on a good road Today, the noise appear when I run over some small stones which is left on the road. After that I heard the sound 3 times straight during slow speed. After I drove it for another 5km, the sound disappeared. My guess is same as you guys now which is the stone that making the noise. BUT! after I got home, I check my wheels and these scratches appear in my both rear wheels. Both on the front don't have any scratches (I still don't know why.) So it really make sense that those rocks I ran over cause the noise, and maybe the cause of these scratch. But i'm wondering how could the rocks goes inside so easily, why other Models like F30 don't have this kind of problem? Attached Images
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01-13-2017, 11:56 AM	#171
David1 Brigadier General 814 Rep 3,952 Posts Drives: 09 E92 09 X5 Join Date: Mar 2007 Location: Columbus, OH iTrader: (1)	Those marks are normal and not from stones. __________________ 2021 M2 Comp Sunset Orange \|Black with orange Stitching Dakota Leather\|Executive Pkg\|DCT
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01-13-2017, 05:07 PM	#174
mofomat Colonel 792 Rep 2,234 Posts Drives: Audi R8 V10, BMW 330e Touring Join Date: Aug 2005 Location: Maastricht, NL iTrader: (0)	I have an August production M2, delivered in September last year. I've had these noises sporadically since about 500 miles. Today though was a new experience. I was at low speed turning right onto a roundabout, maybe 15 mph. At the same time as the noise was emitted, the rear of the car jolted as if I'd ridden over a kerb. I looked in my rear view mirror to see what I'd driven over and there was nothing there. It has never jolted before. This is getting very disconcerting, and I'm going to contact my dealer tomorrow. Has this happened to anybody else?
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01-15-2017, 01:05 AM	#175
Johnsonuspp Second Lieutenant 44 Rep 226 Posts Drives: 2017 LBB M2 Join Date: Sep 2012 Location: San Francisco iTrader: (1)	It's happening to me I also have an 2016 August build. The noise is coming from the right rear. Took it to the dealer immediately and he said it was rocks, it's really loud but intermittent so of course it didn't do it when they test drove it. I haven't experienced a shudder yet but I only have 3600miles on the odometer. I hope a resolution can be found or someone getting to what's really causing the noise.
	Appreciate 1 Prodigy.697.50 Quote

01-15-2017, 04:59 AM	#176
Doji desu Private 118 Rep 60 Posts Drives: GR Yaris Join Date: Mar 2016 Location: Australia iTrader: (0)	I've had the rear 'jolt' quite a few times but mine was a direct correlation to right foot movement. Still the odd noise from the backing plates. Still frustrating and annoying. If you can reverse when you hear the noise the stones seem to clear quickly. Not a good solution in traffic though.
	Appreciate 0 Quote