from another post on another thread:
"Well, the dealer had my truck from Monday through Friday last week. I spoke with the tech who was working on my truck and he said that he put two sets of new rotors and drums and still had the vibration. They called Toyota Corp. who advised that most of the continuing problems were associated with axle runout issues. They discovered that my left rear axle had excessive runout over specs so they ordered and replaced the left rear axle. Additionally, I got new rear bearings and brake pads for all tires.
The tech explained that if the axle has excessive runout then the hub will rotate out of round causing the rotors and/or drums to warp because the brake pads will grab unevenly. I'm no car expert but it makes sense to me.
Anyway, it seems to have worked at least for now. It is smooth as silk. This may be an answer for those of us that have continuing brake vibs after the TSBs are done. If this doesn't last, I will have to go for the "L" law to get a new truck."
NOTE: others have speculated that the front differential on 4x4's is the problem.
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