Intermittent steering shake

[mddecker]

So last week I am on the freeway, doing 60-65, when the steering wheel starts shaking/shimmying pretty badly. At first I just figured it was the road, but when I hit the brakes the shake intensified. It did this for about 3-5 minutes then just went away while I was still on the freeway.



My first reaction is that is either tires are out of balance (same tires for 3 years) or my rotors are warped (I did put new pads on last summer, but did not replace the rotors) – however the problem had gone away. Until today, again on the freeway, and the steering started shaking for a couple minutes – but then went away again!


Any thoughts? Thanks!