Jasonharper
New Member
Some information from Volkswagen explaining auto hold and brake pressure https://www.volkswagen.co.uk/technology/driver-assist/braking
See my text in other forum. https://www.motor-talk.de/forum/aud...uf-im-stand-t6568432.html?page=7#post61359763 If you change to original Audi DMF, you may get DMF with same design specs which cannot dampen the vibration in low idling rpm's / frequencies.There are users that still have the vibrations after changing the DMF. And the same DMF is used in other cars so if it would be just about DMF I think there would be way more users but I would still try to change it. I would choose SACHS instead of Luke because Luke is OEM part and if it has any problems maybe SACHS doesn't have it. I just don't get the temperature dependence in this equation. I really must drive on a highway for about one hour when it is cold outside. The engine itself is warmed quite fast but this has to be something else and I think that DMF is warmed up way slower and maybe once it reaches a certain temp it stops vibrating. But as I said it can be a combination of more parts.
The only time when mine doesn't vibrate is when DPF filter regeneration is active but I doubt that it is only due to the raised RPM because mine are permanently raised by 50 rpm and it still vibrates. Maybe the clutch is less engaged during the regeneration (I don't have a VAG cable right now so I can't check it)
See my text on other forum. https://www.motor-talk.de/forum/aud...uf-im-stand-t6568432.html?page=7#post61359763
I just saw that. I have notifications for that topic. I like your interest in this. You may be on the right track but I still don't think it would be that easy. According to the brake pressure ... also in my case, it stops vibrating when the pedal is just slightly pressed but this doesn't change the RPM. Also, the clutch is still partly engaged when the brake pedal is hard-pressed. You can compare the clutch oil pressure in N with different pedal positions. But different pedal position definitely changes the torque on the DMF and mass which is connected to it. I would really like to change the DMF but spending the money just out of curiosity is not the best idea. I am used to shifting to N while idling which is also beneficial for clutch wear.
I am curious what would be the answer if more users unite and write to Audi about this
I am waiting for an approval for the repair from the used car warranty manager (non-Audi company where I bought the car a while ago). Parts and their repair / change are included to used car warranty coverage. Parts are coming from and the repair will be done at the local Audi center (hopefully). I did 3 weeks ago a DMF part query also to a local Audi center. According to them, here in the Nordics there are not even single DMF of this model in the inventory and Audi Germany's inventory shows orange meaning that it may take some time to get it on here. Before confirmed delivery time of DMF, the repair cannot be scheduled.When and where are you getting the work done?
Sent from my iPhone using Tapatalk
I am happy that your problems are gone. Thanks for letting us know. I think that the noise you heard wasn't from the DMF but from the shaft. I have the same noises and saw this problem also on facebook A4 b9 group. Multiple users reported that this is a common problem. May I ask what kind of DMF did you get? Original Sachs? thanksLatest update. My car got diagnosed today by Audi Center. DMF as well as front right side shaft's both inner and outer joints need to be replaced.
DMF is keeping noise when opening right front window and driving close to wall. In normal drive the noise cannot be recognized in the cabin. They did the diagnosis by lifting the car while engine is running and then listening under the car from where the noise is coming when someone is accelerating the car on the crane.
Yes, you are right. The major noise was from the right shaft, but there was also a noise from the DMF based on what Audi center told me. I do not know the DMF manufacturer, but it is Audi original, thus I think it is Sachs. Even after having these repairs, the car still have some loose in power line which can be recognized during the gear shifts. I think the dual clutch should have been changed also. I did not have anymore time and patience to start a new problem solving and cost negotiating process with Audi goodwill process and used car dealer, so I decided to sell this car. I owned the car for about 8 months and it was under the problem solving process all the time.I am happy that your problems are gone. Thanks for letting us know. I think that the noise you heard wasn't from the DMF but from the shaft. I have the same noises and saw this problem also on facebook A4 b9 group. Multiple users reported that this is a common problem. May I ask what kind of DMF did you get? Original Sachs? thanks