Assuming the company who skimmed your discs did a good job try this:-
Get the front of the bike off the floor so you can spin the front wheel. Use a piece of wire taped or cable tied to each fork leg ant level with the disk surface as a reference pointer. Try to get as small a gap as possible. Now spin the wheel and observe the gap between the wire and the disk. There should bo little in the way of perceptible difference in the gap throughout the whole disc area. If you can see a 'wobble, the discs could well be warped. Also remember that these discs are semi floating, that is they are designed to have a minimal amount of lateral movement on the mounting bobbins.
With sliding calipers, they can absorb quite a bit of warp in the disc before you get much in the way of brake shudder. If, as you say, these have been recently rebuilt, there should be no problem here. Are the pads new too?
If discs and calipers are OK, check the following:
1 Disc bolts.
2 Caliper bolts
3 Tyre pressure and tread condition
4 Wheel bearings
5 Steering head bearings
Hope this helps and I'm not 'teaching Granny to suck eggs!'
Rich
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