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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 11-01-2009, 11:36 PM   #1
towlie
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Weird thumping noise in rear when braking.

Alright so I have done a search, having trouble figuring this one out. When I brake softly the noise isn't noticeable, but if I brake hard or aren't REAL soft on the brakes I hear a noise come from the rear. This noise has also appeared when first driving away. It sounds as if something if shifting and clunking in the rear. My trunk is clean so I have eliminated that possibility. I had my rear shock mounts replaced about 8000 km ago and the sound has come and gone since then. The rear diff fluid got properly replaced so that is not the issue either.

Any ideas on what it could be? I am fearing that it is sub-frame damage, although I have had the inspection II done 8000 km ago and nothing was mentioned about it. Help is appreciated.
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Old 11-02-2009, 08:51 PM   #2
towlie
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UPDATE: Went to the mecahnics today. They replaced the rear shock strut mount saying that it was loose and causing the noise because of shifting. I had them replaced but can still hear the noise when braking. It seems that the noise appears when I am on side streets and only get to 2nd gear and then come to a stop. It also seems to appear more when the downshift is occuring. Is this just a normal noise? I'd love to hear some advice, don't want to waste more time at the mechanics!
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Old 11-02-2009, 10:22 PM   #3
towlie
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anyone?!?!?!?! I'm dying here!
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Old 11-02-2009, 11:37 PM   #4
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SMG or 6MT?
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03 Steel Gray M3 - Imola Red Interior - SMGII - Premium - HK Sound
Mods: VFE SC Stage 2, SS Ceramic Coated Stepped Headers, S-Pipe, X-Pipe, TMS Subframe Reinforcement, KWV2 Coilovers, TMS Camber Plates, Powerflex RTAB's, Rogue RSM's, ZCP F/R brakes

Coming Soon: Open to suggestions

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Old 11-03-2009, 12:02 AM   #5
towlie
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Smg
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Old 11-03-2009, 09:24 AM   #6
stolidog
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Have you checked your battery? On both my 325ci and my M3 the battery carrier seemed to always wiggle itself loose. Next thing I know, Thunk, Thud, etc... when braking or hitting bumps.
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Old 11-03-2009, 04:10 PM   #7
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I hope it is not your subframe.
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Old 11-03-2009, 04:19 PM   #8
Philbert
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check your RTABs (Rear Trailing Arm Bushings).

How are your tires in the back looking - worn unevenly on the inside or outside only?

RTABs go out around 40-50K miles and screw up your alignment/rear tires fast.

Also, if your mouting bracket is at all loose (not bolted to frame), you can experience a "Clunk"....have it checked by your local BMW indie shop asap.
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Old 11-03-2009, 04:28 PM   #9
grkm3
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do you hear the thump after u come to a complete stop? mine does this occasionally when the transmission shifts from 2nd to first.
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03 Steel Gray M3 - Imola Red Interior - SMGII - Premium - HK Sound
Mods: VFE SC Stage 2, SS Ceramic Coated Stepped Headers, S-Pipe, X-Pipe, TMS Subframe Reinforcement, KWV2 Coilovers, TMS Camber Plates, Powerflex RTAB's, Rogue RSM's, ZCP F/R brakes

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Old 11-03-2009, 05:00 PM   #10
towlie
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Quote:
Originally Posted by Hammertoe View Post
I hope it is not your subframe.
They checked it and said its not.

Quote:
Originally Posted by Philbert View Post
check your RTABs (Rear Trailing Arm Bushings).

How are your tires in the back looking - worn unevenly on the inside or outside only?

RTABs go out around 40-50K miles and screw up your alignment/rear tires fast.

Also, if your mouting bracket is at all loose (not bolted to frame), you can experience a "Clunk"....have it checked by your local BMW indie shop asap.
I will ask them tomorrow. Thank you for the advice.

Quote:
Originally Posted by grkm3 View Post
do you hear the thump after u come to a complete stop? mine does this occasionally when the transmission shifts from 2nd to first.
Sometimes. Its mostly when the gear shifts.

UPDATE: Went back to the shop as the sound was still there. The mechanic drove it and shifted gears hard from reverse to 1st, said it is likely something with the transmission. With 118km he thinks it could need new fluid, reprogramming, something might need to be bled. The sound can be created when shifting gears so I am inclined to believe him.

I will be sure to ask about the RTABS and mounting bracket.
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