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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > Knock/ Rattling Sound on harsh bumps

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      07-07-2018, 03:32 PM   #1
jessetaylor1
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Knock/ Rattling Sound on harsh bumps

4k miles on the car. Just started noticing a clunking, rattling sound out of the front suspension. This only seems to happen going over harsh bumps.

Anyone else notice this?
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      07-10-2018, 09:54 AM   #2
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The brake pads rattle in the calipers. If you rest your foot on the brake a little before hitting some bumps, that's it. Almost every BMW I have owned in the past 10 years has done this.
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      07-10-2018, 10:39 AM   #3
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I'll try that, thanks.
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      07-10-2018, 08:40 PM   #4
jessetaylor1
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Quote:
Originally Posted by David1 View Post
The brake pads rattle in the calipers. If you rest your foot on the brake a little before hitting some bumps, that's it. Almost every BMW I have owned in the past 10 years has done this.
Sound is still there even while braking.
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      07-12-2018, 08:19 AM   #5
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Is your car stock completely?
any aftermarket coilover or camber plates?
Can you be more specific on description of the noise that you get in the cabin while driving?
When did you notice the noise? Recent around 4k miles?

Do you notice any noise when wheels are in full (or more than 2/3 full steer) steer going over bumps at low speed?
Have you done any corner balancing or alignment for certain reason?
Do you track your car?

Sorry for all questions but trying to see figure out where noise comes from.
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      07-12-2018, 12:22 PM   #6
jessetaylor1
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Car has 4k miles or so and sound has been happening past week or so.

Mods: Wagner cat less downpipe and VF Hex Stage 2 Tune/ nothing else.

Sound happens on harsh bumps like train tracks or pot hole type deformations in the road. It sounds as if the front suspension is clunking.

Car is my DD and no track driving yet.
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      07-12-2018, 01:20 PM   #7
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Quote:
Originally Posted by jessetaylor1 View Post
Car has 4k miles or so and sound has been happening past week or so.

Mods: Wagner cat less downpipe and VF Hex Stage 2 Tune/ nothing else.

Sound happens on harsh bumps like train tracks or pot hole type deformations in the road. It sounds as if the front suspension is clunking.

Car is my DD and no track driving yet.
Hm...
If you have camber plates usually clunking noise is normal.

If you hear the clunking sound at full wheel turn over bumps at slow speed, it will most likely be the upper strut/mount nut/bolt that is lose.

As you never have touched any suspension no modification and considering the car is relatively new, I don't think it would be the strut/mount joint problem. However, try to make full turn (left or right see if they both or one side make sound) and go over a shallow bump at low (~5 mph) speed. If it does make clunky noise, then most likely it will be strut/mount joint.

If you do not hear anything, things can get trickier. Then, it is not easy to diagnose the problem without actually conducting a close inspection.

Try to listen more carefully to check where the noise is coming from (driver or passenger side), if you have a lifting jack, take off the wheel and check for a bad/loose tie rod and ball joint, checked torque on all suspension bolts, checked the shock for oil leakage etc. If you find everything looks find, it also could be swaybar link.

Sorry mate that I cant help much but thats all I have to say...
Best way is to take her to dealership (but as yours is flashed, you might feel not good to go see dealer directly, then best way is to take her to reputable mechanic around you).
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      07-12-2018, 08:31 PM   #8
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Appreciate the detailed response and help. I may bring it to the dealership and get some info.
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      07-13-2018, 03:41 AM   #9
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Check the things that were changed..... so you had DP installed make sure all is tight and alignment is correct and not close to anything. The exhaust moves a bit and will expand backwards when hot. Always look at what a shop touched first...something probably came loose
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      07-13-2018, 06:35 PM   #10
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Wheel bearing. I had a similar problem that only showed up after installing camber plates. My mechanic found an X5 TSB that addressed the problem. Easy fix - no parts just disassemble, re-grease and torque to new, higher spec.
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      07-13-2018, 07:47 PM   #11
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Quote:
Originally Posted by srswans View Post
Wheel bearing. I had a similar problem that only showed up after installing camber plates. My mechanic found an X5 TSB that addressed the problem. Easy fix - no parts just disassemble, re-grease and torque to new, higher spec.
Bring it to the Dealership, no? And you think this could be given how new the car is?
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      07-14-2018, 01:58 PM   #12
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The upper strut mounts fail also and can do so early
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      09-18-2018, 01:25 PM   #13
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Hi,

I am having the same issue with my M2. BMW have checked the car twice now and apparently there is nothing wrong!

Starting to do my head in - any ideas?

My car is 6 months old, covered just under 4000 miles and is running BMW M Performance coilovers. Just to note, the car made this noise before the coilovers which BMW installed.

Cheers

Tom
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      09-19-2018, 06:04 AM   #14
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This is the noise I'm getting but only under 40mph and front the front end obviously. Do you think it will be the same thing?

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      09-19-2018, 09:18 AM   #15
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Quote:
Originally Posted by T26TGT View Post
This is the noise I'm getting but only under 40mph and front the front end obviously. Do you think it will be the same thing?

That's the exact sound I'm getting. Although it only happens when I hit a significant bump, not as I'm driving down the road as in the video.
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      09-19-2018, 09:50 AM   #16
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Quote:
Originally Posted by jessetaylor1 View Post
Quote:
Originally Posted by T26TGT View Post
This is the noise I'm getting but only under 40mph and front the front end obviously. Do you think it will be the same thing?

That's the exact sound I'm getting. Although it only happens when I hit a significant bump, not as I'm driving down the road as in the video.
Same here, has to be a significant bump not all the time. I can't get a go pro under the bonnet else I would do my own video. This is the best video I could find that sounds the same.
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      10-03-2020, 03:52 AM   #17
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Has this issue been resolved?
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      10-05-2020, 10:33 AM   #18
jessetaylor1
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Quote:
Originally Posted by Alfy View Post
Has this issue been resolved?
Not really, but I've yet to get it looked at.
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      06-13-2021, 08:57 AM   #19
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Quote:
Originally Posted by jessetaylor1 View Post
Not really, but I've yet to get it looked at.
Was this ever resolved? I am having a similar issue with my brand new 2021 M440i. Here's my best effort at recording the noise.

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      07-21-2021, 05:09 AM   #20
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Quote:
Originally Posted by dwj6211 View Post
Was this ever resolved? I am having a similar issue with my brand new 2021 M440i. Here's my best effort at recording the noise.

Dude. Blinking, really?

Just take it - sounds like they might have forgotten something with the inspection they make before they hand you over the car.

Deffo not normal sound.
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