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"Crunch" or squeak from front suspension

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Old 01-05-2013, 09:07 PM   #1
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Default "Crunch" or squeak from front suspension

Recently, my A8 has started to make a crunching/ squeaking sound. It is only pronounced under low speed compression, and only does it from a "cold" start (it's worst if the car sits at the airport for a day or two or three, but once I drive a few miles it pretty much completely goes away). It makes noise over a low speed speed bump, or dip (thus low speed compression), but I can't make it make noise by making hard S-turns at 30MPH, loading up each side, and it doesn't make any noise when hitting manholes.

Given that it goes away with a little bit of "use," I'm thinking a bushing somewhere, but I haven't had a chance to go dig around yet.

There doesn't seem to be any noticeable play in anything from a driver perspective, but obviously, something is worn.
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Old 01-05-2013, 09:30 PM   #2
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Default Try the usual:

in this order:

1. Front upper control arm inner bushings-- look for distortion, cracking and ultimately tear out. This is basically a when, not if, on any of the heavier Audi's w/ this general design. if you are at 60-75K miles, likely visibly worn by then.

2. Lower links that tie front roll bar to lower suspension -- look for distortion and elongation in bushing area. Will wear some w/ miles.

3. Rubber bushings on roll bar where it bolts up to body; can last a long time, but if it gets oil/grease soaked or some other fluke, could explain your noise.

4. Most anything left in suspension; can spray any selective suspect areas w/ silicone and see if creaking subsides; if so, you have your suspect part.
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helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

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Old 01-05-2013, 09:37 PM   #3
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+1

But I would almost bet that #1 is the culprit.
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Old 01-06-2013, 12:01 AM   #4
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It's the hood seal in cold weather, pop your hood one stage and drive and listen. lube it.
it's the body flex
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Old 01-06-2013, 04:47 AM   #5
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For me it is #3. I just douse it in silicone spray every 6 months and it stops. You have to buy a whole new ARB to cure it as the bushes are bonded on.
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Old 01-06-2013, 05:54 AM   #6
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Quote:
Originally Posted by snapdragon View Post
For me it is #3. I just douse it in silicone spray every 6 months and it stops. You have to buy a whole new ARB to cure it as the bushes are bonded on.
I have this on both my A8's. Mind going into more detail exactly where it is/ where to spray. Possibly a picture if possible?
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Old 01-06-2013, 10:28 AM   #7
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I had the same issue (winter only) when passing over a depression a few blocks from my home on cold mornings. Kind of a "scrunching" sound that happened every day but only when the car was cold. The dealer would lubricate the upper control arm bushings when I would complain and that seemed to diminish the problem. A deeper fix would be expensive I'm sure. It was (no longer have the S 8) frustrating when that was the only car I owned that would "scrunch" when going over that same depression. McBucky
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Old 01-06-2013, 12:31 PM   #8
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Originally Posted by Brozee View Post
I have this on both my A8's. Mind going into more detail exactly where it is/ where to spray. Possibly a picture if possible?
Sadly, you have to remove the plastic undertray, then find the roll bar, a shiny black ~30mm thick bar across the width of the car behind the front wheels. There are bushes as in the photo below. I use silicone spray in an aerosol with a straw and try and get it between the rubber and metal in the join.

http://www.ebay.co.uk/itm/Audi-A8-D3...-/130592433684
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Old 01-06-2013, 05:15 PM   #9
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Quote:
Originally Posted by McBucky View Post
I had the same issue (winter only) when passing over a depression a few blocks from my home on cold mornings. Kind of a "scrunching" sound that happened every day but only when the car was cold. The dealer would lubricate the upper control arm bushings when I would complain and that seemed to diminish the problem. A deeper fix would be expensive I'm sure. It was (no longer have the S 8) frustrating when that was the only car I owned that would "scrunch" when going over that same depression. McBucky
That dealer is crook. Lubricating busted bushings takes care of a sound for some time but doesn't repair anything.
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Old 01-07-2013, 07:56 AM   #10
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My guess was the upper control arm bushings, but I had thought about sway bar bushings being a possible idea. I had not thought of the hood, however....

I'm off for a few days after this week, so I guess it'll be time to go look and play....
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Old 01-20-2013, 12:29 PM   #11
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Well this is interesting... did some poking around... and my sound is coming from the left front fender!! With the car in the garage, and obviously totally still, if I just push on the fender behind and below where it meets the headlight, it makes the sound I'm hearing.

Now, I absolutely HATE dealing with anything bodywork related, so anyone have any ideas what's making contact that I'm hearing this?
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Old 01-22-2013, 08:58 AM   #12
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could someone post the picture where we are suppose to lubricate it??

i have the same problem.. granted it is -11F outside with
wind chills of -30F

but would still like to get rid of the "crunchy" noise
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Old 01-22-2013, 11:17 AM   #13
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could someone post the picture where we are suppose to lubricate it??
See yellow stars.
Silicone spray, maybe furniture polish between rubber and metal.
Some types of oil/grease *may* be bad for rubber.
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Old 01-22-2013, 11:43 AM   #14
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and here i am thinking this is in the engine compartment, under the hood area

thank you!
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Old 01-23-2013, 02:49 PM   #15
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Took my car in to the dealer yesterday. I had a brake flush done a couple months ago there and recently since the weather got colder my brake lights would turn on overnight on their own and drained the battery. I suspected air still in the lines so took it back.

I also had a few concerns about some noise in the front end, mostly on the front left (Drivers Side) exactly as you guys said, heard a rubber crunching sound. Got the call today turns out Bad Control Arm Bushings and Sway Bar Bushings. As well as the front struts being blown.

So definitely get it checked out if you hear the crunching sound. I had heard some noise back in October and took it in for a checkup but Dealer said they didn't see anything wrong. 3 Months later all those Bushings need to be replaced.
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Old 01-23-2013, 03:12 PM   #16
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Quote:
Originally Posted by Green0j0s View Post
Took my car in to the dealer yesterday. I had a brake flush done a couple months ago there and recently since the weather got colder my brake lights would turn on overnight on their own and drained the battery. I suspected air still in the lines so took it back.

I also had a few concerns about some noise in the front end, mostly on the front left (Drivers Side) exactly as you guys said, heard a rubber crunching sound. Got the call today turns out Bad Control Arm Bushings and Sway Bar Bushings. As well as the front struts being blown.

So definitely get it checked out if you hear the crunching sound. I had heard some noise back in October and took it in for a checkup but Dealer said they didn't see anything wrong. 3 Months later all those Bushings need to be replaced.
Problem with your brake lights could be brake light switch ($15). It is just above the brake pedal. If your mechanic bleed breaks old way switch worked some overtime.

Broken bushings could be easily overlooked in the early stage. Three months and cold weather could make a difference.

Front struts wise I would definitely look for second and third opinion. Each one is $1500 plus labor and you didn't mention any symptoms.
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Old 01-24-2013, 09:47 AM   #17
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Forgot to say the car was lowering itself pretty low on the front end over night.

When I would go out to turn the car on in the morning my front tires were tucking in the front fenders. Car would lift up right away as I got into the car but this was every morning.

Good thing, dealer called me to let me know my extended warranty only needed me to call in and confirm the repairs. All is being covered. I'll have her back next Wednesday.

For now enjoying driving the new Supercharged A6. Quick little sucker.
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Old 01-24-2013, 10:26 AM   #18
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You forgot to say two minor things: that your front end is bottoming overnight and that you have warranty. From what you didn't forget to say I was under impression that you need some help.
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Old 01-26-2013, 11:02 AM   #19
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Just saw this by chance...
Makes me think superglue would be a good fix.
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Old 01-30-2013, 02:37 PM   #20
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F@kk!!! Spoke too soon.

Now getting push back from the warranty, not wanting to cover the air struts even though they are covered and are faulty.

Audi Dealer told me they confirmed no leaks in the lines and Valve Block, compressor is also working fine too.

The warranty adjuster says he needs proof from the dealership that the air struts are leaking. I don't know what else to do now. Dealer says they showed the adjuster the air lines, compressor and valve block holding pressure, but the adjuster/warranty wants more they want to see the leak from the struts. Audi says the air bags are enclosed and they can't simply spray water on it to show the leak. wTF!!!

Anyone ever go through this!?
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Old 01-30-2013, 02:37 PM
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2005, 2007, a8, a8l, audi, bar, cold, creaking, crunching, hood, noise, plastic, seal, squeaking, suspension, sway

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