Greetings.
Since buying my IS200 the steering seemed not very precise in that I had the impresion of chasing it as it wandered a bit, always making very small corrections, not like my Celica, which is a delight to drive, as though on rails, (terrrible road noise though) and from time to time the car shuddered under braking so after putting up with it for a quite a while it had to be fixed.
First the radius arm bushes were changed using urethane bushes, that fixed the wandering, but still shuddered. Quite nice to drive now.
Second I measured the run out of the front discs and found the nearside 7.5thou out and the offside 3.5thou, changed the discs, problem solved. I had also checked the slide pins which were OK, surprised at how cheap the discs are ($50 NZ ea).
Had an SD1 which had the very same shuddering and the disc run out was also 7thou out.
Hard to equate these VERY small measurments with such a violent effect.
Regards
Malcolm