No, braking itself always feels fine. No body moving or similar feeling.

 

LCA's are a weak point on these vehicles. Mine checked out OK until I took a look at the bushing just about under the drivers/passengers feet, which is where the rear of the Lca is attached . It was badly worn and causing my vibration. Make sure you use the right control arm as I got the wrong ones and it wore out a brand new pair of front tires in less than 3,000 miles. Ended up getting new LCA's and new Tires. expensive mistake...

 

There are threads about the Moog problem solver ball bushings

 

Those lower control arm rear bushings that seem Ok are prolly not OK. They are frequently not OK. They're prolly the 2nd most common front suspension problem after sway bar links. If one's bad, it would explain al your problems.

Take the LCA's off and check the rear bushings and ball joints. Ths front bushing are almost always fine. Replacing the LCA assemblies is an option.

 

So I have ordered this ACDelco left control arm from Rockauto: https://www.rockauto.com/en/moreinfo...=10401&jsn=682
And received a part, which I wonder whether is a genuine or the correct part.

There seems to be a genuine ACDelco sticker on the cardboard box with the correct part number:


There's this sticker on the bag (I haven't opened the bag yet in case of return):


And this is stamped on the control arm:


Are these two holes in the rear rubber bushing normal?


And that's the ball joint with a short "stump":


But all the control arm pictures on Rockauto from ACDelco, Dorman, Mevotech etc. show longer "stumps", for example here.

We haven't removed the suspected control arm from the car yet. So I haven't been able to compare them yet.

 

Looks normal GM LCA to me, the holes in the bushing are the pivot points of the bushing.
Double check when you have the old LCA removed.

 

As correctly suggested by you guys, the LCA rear bushing was toast. Thanks!
Didn't last for even 80'000km (AC Delco)... After replacing the left LCA, everything is fine again.

 

This is why I suggested pressing in the Moog K201285 , it’s a poly bushing not rubber or urethane.