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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > The M2 and the 'soda can crunch noise' issue: compilation of some experiences

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      11-11-2016, 04:06 PM   #111
andrettifan
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When I recently took my car in for the 1200 mile service, I reported to the service manager that my car had "crunched the can" at least a dozen times and told them about reading on this forum what some dealers had done with the brake shield screen remedy - and asked if they would investigate this either with other dealers or with the BMW service rep. The dealer told ME to research which dealers had carried out that sort of service / remedy and said that when the BMW service rep was in town they would report my complaint and see if this was a common problem. Duh! I suggested they check out this forum if they wanted evidence that the problem was widespread and they told me essentially that they don't believe or follow forum information as a source of information for technical problems. What might help some of us is for some of those of you who have had your dealer carry out the screen solution report here the dealer's' name. I think if I could tell my dealer what other dealers have done to address the problem, them might actually check with those dealers and we might get more widespread success - at least we'd have more M2s with the screens on the brakes and a larger sample of experience to see if that really is solving the problem.
Bottom line? If you've had that work done, please tell the rest of us your dealer's name.
Meanwhile, I now have 1600 miles and my car continues to "crunch the can" about once every 100 miles.
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Last edited by andrettifan; 11-11-2016 at 04:08 PM.. Reason: additional info
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      11-11-2016, 10:51 PM   #112
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Mine happened like 30 times before the screens, two very quick squirt since. The sales guy has an M4 and he had the same experience.

Freehold BMW NJ
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      11-11-2016, 11:08 PM   #113
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I am now 99% convinced that what we're all experiencing are rocks getting stuck between the brake rotor and the dust shield...
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      11-12-2016, 06:21 AM   #114
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Quote:
Originally Posted by ried View Post
I am now 99% convinced that what we're all experiencing are rocks getting stuck between the brake rotor and the dust shield...
I am 100% convinced. No longer concerned about it. If there is no modified backing plate on its way I will modify mine by bending the return back from 90 degrees to maybe 60 and opening up the gap to let the stones fall out.
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      11-12-2016, 06:27 AM   #115
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Originally Posted by Doji desu View Post
I am 100% convinced. No longer concerned about it. If there is no modified backing plate on its way I will modify mine by bending the return back from 90 degrees to maybe 60 and opening up the gap to let the stones fall out.
My dealership told me there is a modified version on its way. They have them on order for my car as I said in a previous post.
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      11-12-2016, 09:31 AM   #116
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Quote:
Originally Posted by J.M View Post
Quote:
Originally Posted by Doji desu View Post
I am 100% convinced. No longer concerned about it. If there is no modified backing plate on its way I will modify mine by bending the return back from 90 degrees to maybe 60 and opening up the gap to let the stones fall out.
My dealership told me there is a modified version on its way. They have them on order for my car as I said in a previous post.
Any way you could post a part number please?
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      11-12-2016, 01:50 PM   #117
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Quote:
Originally Posted by RPM2-85 View Post
Mine happened like 30 times before the screens, two very quick squirt since. The sales guy has an M4 and he had the same experience.
Freehold BMW NJ
Thanks for the update. Appreciated.

The few noises you heard ever since the fix with the screens (mesh guards near the rear brakes), did those sound like the metallic grinding in the videos of the first post of this thread or were these any different ?
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      11-12-2016, 02:23 PM   #118
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I'm now convinced there are at least two distinct types of noises with separate causes. There is the rock grinding noise, which is a relatively slow but very loud grind. There is also the quick soda can crunch type noise that seems to be less loud and dissipates much quicker. I've had both.

Just now had a rock noise and also heard it from the outside very distinctly as my car was being pulled into a detail shop by someone else. Then I heard it inside the car as I was leaving the shop. It disappeared once I left their driveway as the rocks dislodged over a bump.

Periodically I also hear the soda crunch noise if I have windows down. It is much more subtle. Not sure the cause for that.
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      11-12-2016, 04:18 PM   #119
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Lightbulb PuMA for M2 rear brake protection plates

A BMW "PuMA" = "Problem und Maßnahmenmanagement Aftersales" = "Problem and Measures management Aftersales" = a worldwide BMW database of all reported problems and most with the their appropriate fixes. It's BMW's online technical hotline for dealers. Info is considered to be confidential. If an issue is not reported yet, the dealer fills out a form for submittal to BMW's technical gurus and subsequently they send back a response outlining what BMW wants the dealer to do to fix the car. Sometimes it's "replace such-and-such" and sometimes they ask for more diagnostic info.

Now, it appears that for the M2/M3/M4 a PuMA exists (also) for the following part numbers (previously part # 34 21 2 284 745):
  • part # 34 20 8 053 265 (rear brake - protection plate - left hand side);
  • part # 34 20 8 053 266 (rear brake - protection plate - right hand side).
So, yeah, there is something about the original protection plates of the M2/M3/M4 rear brakes + there's a fix.

I will ask my dealer to look up this particular PuMA in view of my future 20K km maintenance. If anyone can retrieve the PuMA and/or its reference number, feel free to let us know.

Name:  ProtectionPlate.jpg
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Last edited by Artemis; 11-12-2016 at 04:23 PM..
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      11-12-2016, 08:35 PM   #120
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I can agree two different sounds, but both come from the same source. I would hear them both at the same time in quick sucession often. Now seems to be very fast and much quieter one or the other.

I'm interested to see the new plates.
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      11-13-2016, 05:04 AM   #121
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Went for a drive today and encountered some gravel sections, experienced the stones stuck in between the shield for the first time, definitely different than the other sound i have experienced, more of a grinding noise as i drove along, knew what it was straight away, pulled over and emptied a couple of small stones out, was really hoping this was the source of the other noise.
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      11-13-2016, 06:57 AM   #122
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Mine made that same loud sound from the video, with only 35mi on it. So not fixed as of prod wk 41.
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      11-13-2016, 07:05 AM   #123
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Quote:
Originally Posted by zenmaster View Post
Mine made that same loud sound from the video, with only 35mi on it. So not fixed as of prod wk 41.

I just got my diff replaced this week along with the 1200 mile breakin service at 950 miles. Only put 20 miles since. no noise. Did have a low grade drone, "road noise", before swap. I had attributed that road noise to the tires. Now seems quieter, in fact it was the first thing I noticed (after I realized the dealer put 10 miles on the car), with the new diff but much too soon, and perhaps too subjective, for me to comment. Only put 20 miles getting her home. Maybe it was the diff?

Did experience the soda can crunch and high pitched sound (I agree two different sounds) about 10 times over 950 miles. Will try to keep an "ear" out for it as I put on more miles and also report on the "road noise".

Would be interested in knowing if anyone who has had the diff replaced on recall, not at port, experienced the "soda can crunch" noise after replacement? I think someone on this forum did notice the noise after diff replacement but that was port or dealer replacement early on during the "delivery order stop".

It may be that this soda can crunch noise is a normal intermittent diff noise. Certainly almost everyone, regardless of build date, has experienced it. The M diff is fairly complicated.

Perhaps the recall was for another unrelated diff issues? The only official BMW comment, as i recall, mentioned noisy diff and potential for premature wear but nothing more specific.

Last edited by reppucci; 11-13-2016 at 07:25 AM..
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      11-13-2016, 12:45 PM   #124
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The updated backing plates have been around for a while and should be factory installed in all M2/3/4.
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      11-13-2016, 01:35 PM   #125
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Just a thought, the "soda crunch" sound could be pebbles/rocks that get pinched and rolled across the ribs of the protection plate.

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      11-13-2016, 03:52 PM   #126
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Quote:
Originally Posted by Tag View Post
Just a thought, the "soda crunch" sound could be pebbles/rocks that get pinched and rolled across the ribs of the protection plate.

Looks like they need to pull the hub to R&R the plates?
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      11-13-2016, 03:55 PM   #127
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Quote:
Originally Posted by Tag View Post
Just a thought, the "soda crunch" sound could be pebbles/rocks that get pinched and rolled across the ribs of the protection plate.
I can rule that out. Happened to me at only 35mi of driving on clean roads.
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      11-16-2016, 03:21 AM   #128
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I just have a chance to drive the M2 for the first time today. I heard the noise from the engine while press the accelerator lightly during 40km/h. it sound like metal hitting (which i assumed clutch engage?) I don't have any experience in DCT car before, it was my first M. I wonder is this normal? I have MY 2017 AUG. build date, so I think the rear diff is not about this issue because the sound come from the engine bay.

Thank u all very much! Very appreciated for every comments
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      11-16-2016, 04:34 AM   #129
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Quote:
Originally Posted by anurak View Post
I just have a chance to drive the M2 for the first time today. I heard the noise from the engine while press the accelerator lightly during 40km/h. it sound like metal hitting (which i assumed clutch engage?) I don't have any experience in DCT car before, it was my first M. I wonder is this normal? I have MY 2017 AUG. build date, so I think the rear diff is not about this issue because the sound come from the engine bay.

Thank u all very much! Very appreciated for every comments
You have definitely heard a different noise than what we are discussing, if there is one thing we can all agree on is that the noise is coming from the rear of the car and not the engine.
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      11-18-2016, 02:22 PM   #130
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I have a 2017 with only about 600 miles so far. Like everyone else, I get the crunch sound just like we hear in the posted YouTube videos. Probably have had it happen 25-30 times already. Typically very quick and then its gone. When I hear that, my perception is that it originates from the right (passenger) rear of the car. However, I've had one what I would describe as the "rock-in-the-shield" event and that clearly originated from the left (driver) rear of the car and was a continuous grinding noise. To me, it sounded much different that the other crunch sound and it necessitated finally driving the car in a circle and in reverse to dislodge.

So since there seemed to be just a difference in the sound & duration, it had made me think the issue isn't the same. But its good to hear that some folks like RPM2-85 have had the issue resolved so my perception that they are different is probably wrong. I'll bring it up to my dealer at the 1200 mile checkup.
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      11-18-2016, 03:44 PM   #131
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Quote:
Originally Posted by champ_87 View Post
I have a 2017 with only about 600 miles so far. Like everyone else, I get the crunch sound just like we hear in the posted YouTube videos. Probably have had it happen 25-30 times already. Typically very quick and then its gone. When I hear that, my perception is that it originates from the right (passenger) rear of the car. However, I've had one what I would describe as the "rock-in-the-shield" event and that clearly originated from the left (driver) rear of the car and was a continuous grinding noise. To me, it sounded much different that the other crunch sound and it necessitated finally driving the car in a circle and in reverse to dislodge.

So since there seemed to be just a difference in the sound & duration, it had made me think the issue isn't the same. But its good to hear that some folks like RPM2-85 have had the issue resolved so my perception that they are different is probably wrong. I'll bring it up to my dealer at the 1200 mile checkup.
I don't think the diffs on 2017s were affected afaik so this might confirm previous statements from the posts above that what we hear might not be related to rear diff.
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      11-18-2016, 05:25 PM   #132
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Its not your diffs guys.
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