On Ls400 models. If you are experencing heavy vibration upon braking at high speed. make sure you get a good feel as to where the vibration is coming from; as it could appear the vibration is coming from the front of the vehicle. once the front is ruled out, the problem would be coming from the back of the car. it would be "the rear rotors." Have them re-surfaced or better yet, you would be better off buying new ones. I purchase new rotors, and also new brake pads; as if the old brake pads may be un-even if the rear rotors are warped or out of round. I did the work myself very easy to do. the car now runs as smooth as a hot nife going through butter!!

 

I had the same problem, but havent gotten around to investigating. This will definitely help in the process. thanks for the info.

 

I've been having the same issues just have not had the time to do it

 

its a very common problem especially with a heavier car hence more weight equal needing more braking power. I just changed mine out and its already slowly warping.... Recommend using oem rotors or brembo is fine