If it stops after a period of time it has to be something that gets warm or hot and the heat expands forcing the binding item away and then it cools and stops. First to mind is a hanging brake caliper. You might drive the car and right after it stops vibrating, check the wheel rotor for heat. Compare and see if first they get real hot or one is hot when the other is not.
Another thought is that even though you have new tires, a cord could be bad.
Thursday, June 28th, 2007 AT 1:53 PM