Re: shake shake shake . . .
The things that I know of that could cause this are:
Tire out of balance,
Tire with flat spot,
Tire unevenly worn,
warped rotors,
Unevenly worn brake pads,
Not likely but possible, trash on the drive line.
But since you say It does this while going down the road, NO brake applied. I am prone to suspect tire problems. Do you have mud or some thing on the inside of you wheels? Do you have some rocks behind your hubcaps, that is if you have hubcaps. Maybe you threw a weight and just need to have them rebalanced.
I suggest looking at your tires and wheels clean them front and rear, check the where and inflation then get them rebalanced. After that if the problem persists it will have to be brake related. Replace the pads then the rotors. If it is still there, you might have some wire or something twisted up or stuck on your drive shafts but that would be the least likely of them all.
Good luck and let us know how it turns out...
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