Causes of Vibration at High Speeds Can Brakes Be the Culprit?

[AyersN]

One possibility is that the brake rotors turn warped due to temperature buildup in the course of braking. This warping can lead to the brake pads to do uneven contact with the rotors, leading to vibrations even when the brakes aren't field. It's more visible at high speeds because the cycle of the wheels amplifies the pulse.