ArabianKnight

So I have noticed that upon startup when it has been sitting for awhile I get a loud grinding noise that lasts for about half a second and it appears to be coming from the steering column or inside the dash. When I turn the car off and start it again there is no sound, only when it has been sitting for a bit.....say 2 hours. I don't see anything moving until a second later when the noise has stopped and the tweeters and MMI screen rise. I don't hear any hissing sounds or what sound like a compressor either.

dvs_dave

You've answered it yourself where to look first. Tweeters or mmi mechanism. Could also be the steering lock disengaging.

ArabianKnight

The steering lock disengaging should not cause that noise, is that normal or is something wrong?

dvs_dave

Nothing should be making a noise like that unless it's faulty. I'm giving you ideas what to check. I.e Interior motors that run the first few moments after inserting the key/key on.

Shamoye Lewis

probably just one of the vents actuator or something fell in the cabin filter box.... goto the front remove the cabin filter and see if anything strange is in there. look really good, if not check the vents actuators, that is the motors that moves the electronic vents, especially the fresh air vents, the reason you don't hear it immediately, because after the car/gateway goes to sleep the vents close. that takes a while like maybe 10 mins after you close/lock the car. also it could be just one of them defective but that's rear, so you got your work cut out for you.... tip: you can use a high pressure vacuum and suck the vents to see if anything comes up, but you will need to do a dash teardown.... good luck...

ArabianKnight

I am thinking it is the steering column unlocking, will get that looked at. On another note when driving out of my parking garage I can hear the brakes echo off of the walls rubbing like tsst....tsst....tsst....tsst should this sound go away after driving a bit or should it not be there at all?

Junius

Is that when you step in the brakes? If so, OEM Audi brakes are quite noisy. Mine did the same thing until I changed to EBC Red pads for front brakes. Much quieter and same stopping power.

Jack88

When the car has sat overnight, particularly after a rain or on a dewy morning, you can get a thin layer of corrosion on the surface of the rotor. After I wash my car, it's clearly visible and audible until the first stop or two, where the sound is gone. As long as it goes away quickly, it's fine.

ArabianKnight

Well, I am on the top of the garage (5 floors) and I still hear it when i leave, without depressing the brakes. It goes away after they heat up apparently a few miles down the road.

Also,just went from Ft. Meade, MD to Johnstown, PA (about 200 miles). It appears that both the braking and acceleration have 2 stages, depending on how firm you depress the pedals, have to get used to that.....have to say though that the ACC works amazing, glad I have that feature.

Jack88

That construction they're doing around the north side of Ft. Meade has really got the road messed up. I drive onto base in the Challenger and I feel like the steel ball in a can of spray paint.