Hello, hows everyone?

Anyways, I have looked around the web and seen that there has been afew Uplanders with this problem.

When I put the brakes on when driving really slow i DON'T NOTICE the shakin much, But when I drive around 80km it drive FINE, But when it comes to brake it shake bad, Like I am driving over sh*t load ribbits.

I have checked the tire rod, I didn't here any kind of thumbing, so I take it, could be the rotors?

 

It's the easy fix that gives the biggest headache.

I had a 2001 Tahoe that did the same thing. Motoring along easy, step on the brakes and everything fine. REALLY motoring along, step on the brakes and she shimmied like a bellydancer. The harder on the pedal the bigger the shimmy.

Then I had a new set of tires installed and no more shimmy.

 

Yeah, Its my wifes van, and I don't drive it much, but she said it kind of started when she got the snows on, But this was the 2nd year with them, 1st year installed by dealer, and the 2nd year installed by wal-mart...(so that could be the issue, but need to know, something before I go get rotors.