This is a link to a picture of my front disk brake assembly....first in a series of photos.
http://rides.webshots.com/photo/1327...11220610zyKeJn
Note that this is a 1996, which may differ slightly from your 1999.
It looks to me like the way to get to lube would be to remove the caliper.....you want a small amount of the high temp lube in the right place....but NONE onto any friction surface.