Well, I´ve just have find some kind of solution.
If i Upload the pdf docs to my google drive, not to my web server, the links obtined in the sharing by a link option of Drive, works perfectly with Web Viewer component, opening the Drive pdf file preview and letting the user chose to read or download that document.
thanks you all for the support.
In the kind of solution that I found there is a trouble. When I press the Download button In the Google Drive Preview that opens inside WebViewer, the archive downloads with the Google Drive Share link (long and without extension) so is not a perfect solution.