1999 Lexus Gs400 shakes around 70mph?

[Cmums]

I've begun to notice that around 70mph I can feel my car shake a bit. I know that my brakes are definitely in need of being serviced. Could this be the reason it's shaking? My rotors are a bit warped so I was thinking that maybe the calipers could be rubbing. Any ideas? Thanks!

 

[Kenny]

Warped brake rotors will only cause a vibration when you apply the brakes. They will not cause a vibration otherwise.

The source of your vibration is most likely either a bent rim, an unbalanced rim, worn out tires, or a broken belt in one of the tire. It could even be a combination of the options listed. Take it to a shop and have the front end inspected.