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      06-21-2021, 12:16 PM   #1
DetroitP
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Clunk/thumb noise during braking or low speed garage turns (under 5 mph)

Hi Everyone & Thanks in advance for your time,
I have a clunk sound that I can't seem to figure out what's causing it. Let me start by describing the vehicle:

Vehicle:
2008 E92 M3 DCT, supercharged, and everything else is stock (EDC dampeners).

What I have done or checked:
1) Replaced engine mounts, sway bar bushings, and end links.
2) During the engine mounts replacement (did them myself), I did replace the tie-end steering rods (alignment done also) because they were fairly rusty and I couldn't get them off.

The issue seems to be prominent when I do a drive to reverse or reverse to drive maneuver while applying the brakes. To me it seems like whenever the suspension travels and settles, followed by applying the brake the thumb or clunk sounds appears.

I suspect the struts may be at fault, especially front driver side but I am not sure how to check if it is the cause before I make a replacement purchase. Anyone else has had a similar issue or knows what I should check next?

Thanks
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      06-22-2021, 01:17 PM   #2
ganz
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It could be driveshaft u-joint. Do a forum search on that term and many videos of the issue are there to confirm if it is the same sound.
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      06-22-2021, 02:40 PM   #3
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sounds like brakes... check the caliper guide pins are tight... if using aftermarket pads they may knock in the caliper as well due to less tight of a fitment.
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      06-22-2021, 03:02 PM   #4
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Quote:
Originally Posted by DetroitP View Post
Hi Everyone & Thanks in advance for your time,
I have a clunk sound that I can't seem to figure out what's causing it. Let me start by describing the vehicle:

Vehicle:
2008 E92 M3 DCT, supercharged, and everything else is stock (EDC dampeners).

What I have done or checked:
1) Replaced engine mounts, sway bar bushings, and end links.
2) During the engine mounts replacement (did them myself), I did replace the tie-end steering rods (alignment done also) because they were fairly rusty and I couldn't get them off.

The issue seems to be prominent when I do a drive to reverse or reverse to drive maneuver while applying the brakes. To me it seems like whenever the suspension travels and settles, followed by applying the brake the thumb or clunk sounds appears.

I suspect the struts may be at fault, especially front driver side but I am not sure how to check if it is the cause before I make a replacement purchase. Anyone else has had a similar issue or knows what I should check next?

Thanks

I just got my car (2011 e92 dct) and noticed this as well. I only notice it in my work's parking structure when as I brake, turn, shift to reverse to back up into my space. I too notice it coming from the drivers side.

Curious to know what the issue/solution is.
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      06-23-2021, 07:44 AM   #5
bbnks2
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Quote:
Originally Posted by Hivand_M View Post
I just got my car (2011 e92 dct) and noticed this as well. I only notice it in my work's parking structure when as I brake, turn, shift to reverse to back up into my space. I too notice it coming from the drivers side.

Curious to know what the issue/solution is.
could be strut top mounts
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      06-24-2021, 07:41 AM   #6
DetroitP
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Quote:
Originally Posted by bbnks2 View Post
sounds like brakes... check the caliper guide pins are tight... if using aftermarket pads they may knock in the caliper as well due to less tight of a fitment.
That is very interesting... never thought of that and I will check them. Thx
Quote:
Originally Posted by bbnks2 View Post
could be strut top mounts
I inspected them and everything seemed to look "healthy". Are you referring to the rubber that lays over the top hat?
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      06-24-2021, 10:53 AM   #7
DetroitP
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As far as the brake inspection, are you referring to the star bolts covered by the grommet in the attached pic?
I just tightened them and the noise seems to have disappeared... I will sped a couple of more days driving to confirm and will let you guys know if it had made a difference.

Thanks again for ur help
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Last edited by DetroitP; 06-24-2021 at 12:02 PM..
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      06-24-2021, 04:59 PM   #8
bbnks2
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Quote:
Originally Posted by DetroitP View Post
As far as the brake inspection, are you referring to the star bolts covered by the grommet in the attached pic?
I just tightened them and the noise seems to have disappeared... I will sped a couple of more days driving to confirm and will let you guys know if it had made a difference.

Thanks again for ur help
yes those pins seem to back out on me often. I use blue Loctite on mine now because I am afraid I might end up over-torqueing them trying to prevent them from loosening up. When they get a little lose you get a nice pops from the brakes.

And yes, I was referring to the rubber top hat. They collapse.

Could be many other issues but those two are common things to cause knocking noises.
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      06-24-2021, 06:46 PM   #9
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Thanks! I did the driver side and it didn't help. I am going to try the passenger side next and see how it goes.
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      06-27-2021, 05:30 AM   #10
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Quote:
Originally Posted by DetroitP View Post
Thanks! I did the driver side and it didn't help. I am going to try the passenger side next and see how it goes.
Do you still have your oem splash panel ?
The metal hangers can make a similar sound when going over bumps at low speed or apply the brakes.
Especially when the 2 side pieces are not attached the hanger are not as tight .

Tapping on it to check if it makes a similar sound.
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      06-27-2021, 03:24 PM   #11
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Quote:
Originally Posted by atopa2002 View Post
Do you still have your oem splash panel ?
The metal hangers can make a similar sound when going over bumps at low speed or apply the brakes.
Especially when the 2 side pieces are not attached the hanger are not as tight .

Tapping on it to check if it makes a similar sound.
Yes, I have all the splash panels intact and secure. Thanks for the suggestion.
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      06-28-2021, 06:48 AM   #12
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Quote:
Originally Posted by bbnks2 View Post
yes those pins seem to back out on me often. I use blue Loctite on mine now because I am afraid I might end up over-torqueing them trying to prevent them from loosening up. When they get a little lose you get a nice pops from the brakes.
.
Hmm, good post. I replaced rear rotors and the noise coincidently went away. Probably because I torqued the guide pins to spec this time after completely cleaning them, the caliper, and hub. I'll keep an eye and ear out, nice tip.
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