Posted for <n98pb@sbcglobal.net>:

 Might check the brake disks as well.  I had what I thought was a nose
 wheel shimmy.  Spent money rebuilding the strut and internal shimmy
 damper, no change.  Found that when I braked hard the rotors were
 warping and causing the shimmy.  I went to the high-energy brakes and
 the problems went away.  Just a possibility.
 
 Pat Brunner IVP