My Toyota FJ shimmies when I brake from highway speed sometimes. Tire Kingdom turned the rotors and it went away a little but still comes and goes. 150K miles, I haven't checked into any of the suspension. I've never had this on my Boxster but I have done some tracking with EBC RedStuff (14'ish track days? Two sets of fronts/one set of backs) and never had this. Maybe worn out ball joints or rubber in the front suspension? I have replaced all my parts (except front tie rods) so if it is from that, maybe that's why I never felt it?
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