vibration at 65 to 70 miles per hour, why? on 2003 Cadillac DeVille

Had front wheels balanced did not stop the problem.I suspect drive shaft problem. Am I correct? Car shakes when braking.

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2 answers
Usually brake rotors that are out of round or have hot spots will cause this have a shop check this and check prices here
when vibating when braking at higher speeds probably is the rotors. The rotors need to be resurfaced. If u can, run your fingers along the front rotors inside towards the outside and if it is very rough it this may fix your problem.I would do this before spending money for a driveshaft