Front vibration under hard braking

[zamorush]

I had this problem for a while now, and tried every possible solution there is to try. When I decelerate from the freeway speed to stop, or when I am driving downhill at 50 to 80 mph, and apply brakes, my steering wheel begins shaking and I have really violent vibration coming from the front end. The problem is not as obvious, or is not present when driving on city streets and decelerating from 40 mph. It only appears under harder loads. It started doing it long time ago, and since then I have done the following things:

Alignment – didn’t solve the problem

Resurfacing of the rotors – solves the problem but only for a month

Changed break pad, rotors, calipers – solved the problem but only for a month

Changed the tires, rotating the wheels around – didn’t make any difference.

What can it be? It is something that makes my rotors uneven, and brake pads unevenly catch the disc. I thought there might be some oil on the disc that makes it slip, apparently not.

I am stuck. Anyone has any idea?