is there any specifically for brass instruments ??
If you wanted synth brass sounds there are many good VST’s on the market, most Native Instruments ones like Fm7 and FM8 will have good brass, Spectrasonics Atmoshere or Omnisphere are also very good.
If you want natural sounding brass then you’re probably best using a VST sample such as Kontakt or Halion and getting a real multi sampled brass sample cd to go with it, unless it actual sampled brass it just wont sound real
if your using logic
search the net for exs24 patches/samples for brass…
like this…
[url]http://www.lo-res.com/nicebeats/EXS24/2903_studioline.htm[/url]
Thanks mate 
helped me loads