For
eventhorizon &
docmental - brake fluid does not get consumed or evaporate - if it is low, it leaked! Yes, it may work if you top it up but it probably minimally requires bled but is a bigger problem waiting tohappen when you least desire it. The leak on yours
eventhorizon is pretty horrible - would replace that asap.
Please replace
both your Master & Slave cylinders - this is pretty common failure on the NSX (do a search - you will find string recommendation from Guru Larry Bastanza that replacing both is a good plan)
Here are some tips on DIY replacement
Incidentally, even as a Newb it's OK to post technical questions in the technical forum. <!--StartFragment -->
Good Luck getting your problem resolved.