Why does my car shake when I brake at high speed?

Shaking that only shows up when you brake from highway speeds (60+ mph) is almost always warped front rotors. The faster you're going, the more energy the pads dump into the rotor surface, and small thickness variations turn into a strong steering-wheel vibration. If the shake is in the seat instead of the wheel, look at the rear rotors. Either way, this is a same-week fix — warped rotors lengthen your stopping distance.

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