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  #1  
Old 03-28-2020, 11:58 AM
philipnjones philipnjones is offline
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Clunking in suspension

I am getting a pronounced clunking noise in my left rear suspension whenever I go over a bump in my 2007 Z4 3.0 Coupe. Any ideas?
Thanks for any help you can offer,
Phil Jones
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  #2  
Old 03-28-2020, 02:27 PM
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Broken rear spring or a failed upper shock mount. Both are common failures on the E85.
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Old 03-28-2020, 03:56 PM
MileHighZee MileHighZee is offline
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My vote is the rear spring. Look it over closely.
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Old 03-28-2020, 05:46 PM
philipnjones philipnjones is offline
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If it is a broken rear spring, are parts available?
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Old 03-28-2020, 05:47 PM
philipnjones philipnjones is offline
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If one spring is broken, should I replace both?
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Old 03-28-2020, 07:53 PM
MileHighZee MileHighZee is offline
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Hi. There are several aftermarket springs available as well as the OEM. Depends on what you are looking to do.
I would definitely replace both at the same time. It is a fairly straightforward job to do. How many miles on it? Maybe now is a good time to upgrade the shocks/springs all at once depending on your situation.
Jack it up carefully and see what the problem is first.
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Old 03-28-2020, 07:57 PM
MileHighZee MileHighZee is offline
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FYI .. . this may not be the BEST way to do it... but you can see it really isn't difficult.



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Old 03-28-2020, 08:55 PM
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Quote:
Originally Posted by MileHighZee View Post
FYI .. . this may not be the BEST way to do it... but you can see it really isn't difficult.



That has got to be one of the most dumbass things I've ever seen someone do while working on a car!
If the weight of the car breaks the bead of the tire loose from the wheel, the tire will instantaneously deflate and the car is going all the way to the ground.
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Old 03-28-2020, 08:58 PM
MileHighZee MileHighZee is offline
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Totally agree! Thought it would raise some eyebrows! LOL. Meanwhile the guy is underneath it with two floorjacks holding it up.... yikes
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Last edited by MileHighZee; 03-28-2020 at 08:59 PM.
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  #10  
Old 03-29-2020, 10:02 AM
philipnjones philipnjones is offline
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The car has 98,000 miles on it. I bought it at 95,000. As far as I can tell from the records, no work has ever been done on the suspension. So if I replace the rear springs, I am guessing that I should replace the rear shocks at the same time?
By the way, this is not something that I would do personally. I have people.
Phil Jones
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Old 03-29-2020, 11:38 AM
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Quote:
Originally Posted by philipnjones View Post
The car has 98,000 miles on it. I bought it at 95,000. As far as I can tell from the records, no work has ever been done on the suspension. So if I replace the rear springs, I am guessing that I should replace the rear shocks at the same time?
By the way, this is not something that I would do personally. I have people.
Phil Jones
If you need springs, then both need to be replaced, and at 98K miles the shocks are due also. Is the car sitting level or is the left rear sitting lower than the right rear? If left is lower, then likely broken spring. If car is pretty level then likely upper shock mount.
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Old 03-29-2020, 12:17 PM
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Clearancediver Clearancediver is offline
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I watched the video twice and noticed that at the end it said to use axle stands.

That said, the gentleman wasnít ďunderĒ the car at anytime. He was working from the side of the car and while the comment about breaking the bead of the tire is a valid point, the weight of the suspension was only relieved enough to allow the shock to be unbolted. At no time was the weight of the car on the tire. The weight of the car was fully supported by the lifting jack at all times.

An elegantly simple procedure overall.


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  #13  
Old 03-29-2020, 02:10 PM
philipnjones philipnjones is offline
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The two sides of the car are the same height. So it appears maybe it is a shock problem.
Here's the funny part of this whole story. About a week ago, I washed the car and thoroughly cleaned the wheels. Lots of water everywhere. Then I pulled the car into the garage and let it sit for about three or four days. The temperature never went below freezing. When I went to drive the car, I started the engine, put in the clutch and let off the parking brake. The car refused to move as I let off the clutch and gave it some gas. The clutch engaged, but it was if I had placed chocks around all of the wheels. I got out of the car and inspected the wheels/tires carefully, then tried it again. Same thing. So I gave it plenty of gas, and the car broke free. I guess maybe that the parking brake had stuck in the engaged position, but the car drove fine after that. I drove it for about 8 miles, and then put it back in the garage. Three days later, I drove it again, and it drove fine, until I got about 2 miles away from my house and the clunking started.
Any connection between the these various events?
Thanks for any detective work you can offer me. On Monday, I plan to call my mechanic and make an appointment, but this thing has got me very curious, so I am spending the weekend obsessing about it.
Thanks,
Phil Jones
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  #14  
Old 03-30-2020, 04:29 PM
philipnjones philipnjones is offline
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Problem has been diagnosed and solved. Most of you were close in your diagnosis, but not 100% correct. Some suggested broken shock mount. The answer was broken shock. So I am replacing all four.
Thank you all for your help. I appreciate it.
Phil Jones
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  #15  
Old 03-30-2020, 04:52 PM
MileHighZee MileHighZee is offline
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Glad you found the answer. Maybe post a pic of the broken shock?
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Old 03-30-2020, 05:43 PM
philipnjones philipnjones is offline
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I have not seen it. I suspect my people will throw it away. They might think me odd if I ask for it. The might think me a car geek, or worse.
Phil Jones
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  #17  
Old 03-30-2020, 08:41 PM
Andyz4 Andyz4 is offline
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Since you're on this site, it's too late. You ARE a car geek.
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  #18  
Old 03-30-2020, 09:01 PM
philipnjones philipnjones is offline
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Of course. I was being a bit facetious.
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  #19  
Old 04-02-2020, 05:04 AM
Tommyboy1028 Tommyboy1028 is offline
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Great Thread

Thank you for the great educational thread! Always love getting to hear what DC and Clarence have to say! Thanks guys! I'm in the process of changing out my shocks and struts! Using YouTube videos by Zed4me for direction. Looks pretty straight forward. Renting a spring compressor from Advance Auto or O'Reiley for the struts! Please Stay Safe, Stay Home, and if you must got out, wash your hands after touching anything!
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Old 04-03-2020, 12:59 PM
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Clearancediver Clearancediver is offline
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Having bought/used spring compressor to do my front struts... I suggest you take it to a garage to have the struts compressed using their professional equipment....like I did in the end. Money well spent.

Frankly to scary using a portable spring compressor... playing with/handling explosives was way safer (I was an EOD operator in my past life).


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  #21  
Old 04-03-2020, 06:05 PM
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Quote:
Originally Posted by Tommyboy1028 View Post
Thank you for the great educational thread! Always love getting to hear what DC and Clarence have to say! Thanks guys! I'm in the process of changing out my shocks and struts! Using YouTube videos by Zed4me for direction. Looks pretty straight forward. Renting a spring compressor from Advance Auto or O'Reiley for the struts! Please Stay Safe, Stay Home, and if you must got out, wash your hands after touching anything!
The front springs on the E85 are particularly short in height and it's very difficult to get the rental spring compressors engaged across enough coils to get them fully compressed. I did it one time and since then I've gone to a shop and spent the $50 for them to use their shop strut tool. https://www.nationaltoolwarehouse.co...RoCY80QAvD_BwE
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Old 04-04-2020, 06:43 AM
Tommyboy1028 Tommyboy1028 is offline
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Thanks Guys

Clarence and DC, Thank you once again! I will start looking for a shop on Monday! I appreciate both of you! Tom
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Old 04-17-2020, 06:53 PM
Tommyboy1028 Tommyboy1028 is offline
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Question about front bump stop

Hey guys, I had a mechanic remove and put the springs on my new Bilstein B-8 front struts. He only charged me $40. I know it was money well spent. I have a 2003 with the M Sport Suspesion. I also gave him new mounts and bump stops to put on. When he gave the assembely back to me, he didn't install the bump stops. He informed me the Bilsteins didn't need the bump stops. Just want to make sure that is correct before I install them. Thank you for your help!!
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Old 04-18-2020, 10:50 AM
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Honestly canít remember... I didnít buy new bump stops for sure though. Might have had old ones reinstalled. I also used bilsteins as replacement for OEM.

My pet theory is that if you need the bump stops, itís time to replace the struts... Pot holes not withstanding, as they have their own ideas about suspensions!

DC is likely more informed on this and likely to disagree with my pet theory.....


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Old 04-18-2020, 08:09 PM
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The bump stops keep you from bottoming the shock and damaging the valving, but it takes a pretty extreme bump taken at a lot of speed to do it.
It's not uncommon with lowering springs to cut the length of the bump stops down or leave them off.
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