I know you mentioned you have new rotors/pads, but is it possible you may have a brake caliper that is intermittently sticking? I have a high mileage RRS and had that problem recently. The vibration would come and go, but it was only notable at higher speeds - 50+. Initially, I replaced bushings, tie rods, that were showing wear, but with no success in solving the vibration. In my case, the "tell" was greater brake dust accumulation on the wheel with the offending caliper.Hi, thanks for reading my post.
So here is the issue. In the morning I start driving, about 2-3 miles street then I hit the highway. Normally whole traffic goes 80 mph or so. Once I climb over 70mph RR starts to vibrate, feels like asphalt is sloted, has perpendicular grooves in it, feels everywhere, floor, steering wheel, pedals... I thought it could be my winter wheels, they are not worn, just 5-6 yo, rubber looks dried with microcracks so I thought they could be out of round but after I had changed to summer wheels, 1 yo, less then 10k on them, issue remains.
Within last 10k or so:
All new brakes (Genuine rotors, EBC Green Stuff pads)
New front airstruts
New LCA all 4
New Sway Bar Bushings
New outer tie rods.
Front bearings were replaced may be 20k ago.
I talked about it with my SA at LR dealer, he says that tires may be developing flat spots from standing overnight and as I start driving, tires warm up and go back to round - logical to assume, since issue goes away after 10-15-20 min driving. But then I thought, it can't be ussue unique to my truck only. Audi Q5 and TT in the family, dont do that, but they also dont weight 2.8 ton... Anyone else has similar issue? May be it is Continental tires I am using? Transmission/motor mounts? - but then vibration would be permanent and probably less high speed dependant.
I have already ordered but did not install yet front and rear driveshafts but I dont really want to just throw in everything that rotates blindly so would like to ask what do you guys think?
Thanks in advance for your input.