You can also navigate through the manuals via the web page without having to download them all. Ive only had luck with Internet Explorer working with this option but you can navigate without downloading a huge set of files. Just click on the fwd.pdf file on the bottom of the page (show below with red arrow) then click on whatever option you need. i.e.
BR - Brake System
it will then forward you to the correct PDF for the category you are looking for.
By the way here is the direct link to the Z34 years 2009 - 2014 without having to navigate to several different links... 
Nissan 370Z Factory Service Manuals