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      12-03-2022, 12:01 PM   #1
TrafficJam
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M760 Bushing Leaking. Need a new Control Arm?

So I have my M760 for 15 months now, everything is good except rims and tires. I got the car come in with GoodYear Eagle F1 AS2 run-flat and they are super hard. I hit a pothole and destroy one front tire on the first day i got the car. In the next 8 months, I got bubbles continuously and have to replace both front tires again. I also repair a rim bent once. But the car never rides perfect, and will always behave horrible when hitting potholes. Then I ditch all run-flat and put on Michelles, the car gets softer, handle potholes a bit better but still not smooth. Initially I thought it was bad balance, but after getting balance twice, still not good.

Finally, I decided to bring in for a full rim inspection yesterday. Ending up got all four wheels bent. But after I drop off the car and get back home, I found some black liquid on the garage floor. It look very recent and is still in liquid form. Later on the rim shop also inform me about this, they think my passenger side bushing is leaking (never knew that bushing are fill with fluid). They sent me photos and I feel like it is a bad leak and seems like it just happened (judge based on the liquid form). I am not sure how this happened? Maybe because I hit a pothole on that side during the thanksgiving weekend?

Now the car is pretty smooth on highway. Unfortunately, I certainly need to bring it into the shop again because of this leak. Do you guys think it is still safe to drive this car around for a few days before I bring it in? Also, does any of you guys encounter this problem before? Does replacing the control arm solves the problem? Thanks!

In the end, I always try to avoid potholes whenever I can. But sometimes those can catch you off guard. Also, I feel like the 7 series is bad at dealing with potholes (even without run-flat), especially in the front. I am not sure if it is because the heavy V12 or the 20" wheels.
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      12-04-2022, 03:51 PM   #2
adam750
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Quote:
Originally Posted by TrafficJam View Post
Now the car is pretty smooth on highway. Unfortunately, I certainly need to bring it into the shop again because of this leak. Do you guys think it is still safe to drive this car around for a few days before I bring it in? Also, does any of you guys encounter this problem before? Does replacing the control arm solves the problem? Thanks!
Yes, this is a DIY fix. The oiled bushing is integral with the OEM part. You can get an aftermarket bushing alone but you need a method of pressing the old bushing out to swap the new one in. Or just get the OEM tension strut for ~ $350. The book recommends a new aluminum bolt and two nuts to do the job as well. Final torque to the bolts is applied after the suspension is carrying the weight of the car.

I drove on mine for what I assume was several hundred miles before the oil finally came down pat the rashguard. Seems fine after the fix. Cheers.
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      12-04-2022, 05:53 PM   #3
TrafficJam
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Originally Posted by adam750 View Post
Yes, this is a DIY fix. The oiled bushing is integral with the OEM part. You can get an aftermarket bushing alone but you need a method of pressing the old bushing out to swap the new one in. Or just get the OEM tension strut for ~ $350. The book recommends a new aluminum bolt and two nuts to do the job as well. Final torque to the bolts is applied after the suspension is carrying the weight of the car.

I drove on mine for what I assume was several hundred miles before the oil finally came down pat the rashguard. Seems fine after the fix. Cheers.
Thanks a lot, I will take a look into this.
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      12-04-2022, 07:21 PM   #4
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Hi
I did mine two weeks ago, you have to remove two bolts and loosen the collar bolt (replace it also)on output shaft to released from wheel bearing. You have to replace bolts and nuts on tension strut
Let me know if you need parts numbers I still have invoice from the dealer with parts number
I drove mine for around 1000 miles with broken bushing-after replacing tension stray some of oil was still there
Have fun
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      12-05-2022, 09:50 AM   #5
TrafficJam
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Quote:
Originally Posted by finestbm@gmail.com View Post
Hi
I did mine two weeks ago, you have to remove two bolts and loosen the collar bolt (replace it also)on output shaft to released from wheel bearing. You have to replace bolts and nuts on tension strut
Let me know if you need parts numbers I still have invoice from the dealer with parts number
I drove mine for around 1000 miles with broken bushing-after replacing tension stray some of oil was still there
Have fun
It will be great if you can provide me some parts number, I appreciate!
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      12-05-2022, 10:00 AM   #6
finestbm@gmail.com
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Hi
Tension strut right side 31106861158
Axel bolt 31-20-6-866-022
Lower Control Arm Nut 33-30-6-760-349
Hex Nut With Flange 07-14-6-875-114
Check this website
If you are in USA this bmw dealer in Orland Park Illinois has a good prices

https://www.bmwpartsworldwide.com
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      12-14-2022, 08:53 PM   #7
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You guys are making me nervous, living in downtown Chicago means that you absolutely cannot avoid all the potholes, you simply will hit one once in a while.

Picked up a bubble in the garbage factory Goodyear runflats about a month after buying the car, ditched them all for a new set of Continental all-seasons that massively improved ride, handling and road noise. Also half the price, tread will likely last twice as long, and no more stupid bubbles. Highly recommend to anyone who still has the OEM runflats to ditch them as soon as you can.

I am hoping I have not bent a wheel, so far it seems I haven't, but at some point you have to come to grips with the fact that these cars are almost 5200 pounds and a bit front-heavy as well, any big hole you hit with the front wheels will be very hard on the suspension (which it makes it all the more painful to think about) - so far no leaking bushings for me but I have it scheduled for some service next week and intended to have them check it over underneath to make sure everything is good.
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      12-17-2022, 08:24 AM   #8
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Quote:
Originally Posted by Derived View Post
You guys are making me nervous, living in downtown Chicago means that you absolutely cannot avoid all the potholes, you simply will hit one once in a while.

Picked up a bubble in the garbage factory Goodyear runflats about a month after buying the car, ditched them all for a new set of Continental all-seasons that massively improved ride, handling and road noise. Also half the price, tread will likely last twice as long, and no more stupid bubbles. Highly recommend to anyone who still has the OEM runflats to ditch them as soon as you can.

I am hoping I have not bent a wheel, so far it seems I haven't, but at some point you have to come to grips with the fact that these cars are almost 5200 pounds and a bit front-heavy as well, any big hole you hit with the front wheels will be very hard on the suspension (which it makes it all the more painful to think about) - so far no leaking bushings for me but I have it scheduled for some service next week and intended to have them check it over underneath to make sure everything is good.
Leaking bushings don't necessarily leak so much that you can see spots on the garage floor. They often just ooze and then it kinda dries up and you just have dark drip spots. A lazy mechanic inspecting such a car might not even notice. It is an early failure point on big heavy vehicles. If I were having someone else look, I would be specific - like "make sure to check if the oil-filled front thrust arm bushings have not leaked oil."
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      12-26-2022, 02:18 PM   #9
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I would get that fixed ASAP whether you DIY or at service center. I was about to go on a trip three weeks ago and it came up on inspection report when noticed fluid on garage floor. It was $1,050 to replace at dealer but I could not wait to shop it around at an indy. This is also normal wear and tear item which may or may not be unique to AWD not sure.
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      01-21-2023, 12:10 AM   #10
TrafficJam
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Quote:
Originally Posted by finestbm@gmail.com View Post
Hi
Tension strut right side 31106861158
Axel bolt 31-20-6-866-022
Lower Control Arm Nut 33-30-6-760-349
Hex Nut With Flange 07-14-6-875-114
Check this website
If you are in USA this bmw dealer in Orland Park Illinois has a good prices

https://www.bmwpartsworldwide.com
I appreciate your help. Your recommended store is even cheaper than the one I always used (GetBmwParts.com).

Last edited by TrafficJam; 01-23-2023 at 10:28 AM..
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      05-04-2023, 01:26 AM   #11
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Quote:
Originally Posted by finestbm@gmail.com View Post
Hi
I did mine two weeks ago, you have to remove two bolts and loosen the collar bolt (replace it also)on output shaft to released from wheel bearing. You have to replace bolts and nuts on tension strut
Let me know if you need parts numbers I still have invoice from the dealer with parts number
I drove mine for around 1000 miles with broken bushing-after replacing tension stray some of oil was still there
Have fun
Was yours xDrive? I'm debating if I should replace mine on a 750i xDrive, but I'm worried that the axle has to be taken off.
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