Which instrument set are you using in the audio engine options? If you're using General MIDI then you need patch 41 for brush sounds - but I'm not sure what your setup is. Can you go into the audio engine options and take screenshots?
I've never needed brushes in Sibelius personally so this is an educated guess...
It could be the noteheads you're using? See if you changing the notehead you're using when writing out the part changes the sound. I know when you're writing out standard drum parts you need to use the 'X' notehead to get cymbal sounds. Might be a similar issue with brush sounds.
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