Peter B IS300 Sport

Look at your front calipers one of them is probably seizing up

i recently bought a 2001 lexus is300 back in march.  it had 41,000 miles on it and now has over 47,000.  so, it's about to be out of warranty.  well, i love the car, but it's making me crazy b/c the steering wheel seems to like to vibrate quite a bit when i brake anywhere between 40-60 miles an hour.  but, when i drive around 80, and brake, it's really smooth and does not vibrate at all.  i went to the tire store to get them balanced and it pretty much fixed the vibration i was getting when i was driving and not braking.  also, when i brake, the tires seem to wobble a little before i come to a stop.  what can i do to fix this?  alignment, new tires, a steering rack, or what?

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I just purchase a 2001 IS300 sport with 18560 mi. During the two test drives I noticed a shimmey in the front end. The dealership had the tires balanced and an alignment done. My wife was driving home and the front end began to shake violently. She pulled over and it stopped. When we got home I looked at the left wheel and noticed a lot of carbon dust on it, I took it out and the same thing happened. It appears to be an intermittent problem.