Posted by Paul(in NY) [12.64.128.156] on Wednesday, October 24, 2012 at 20:18:23 :
In Reply to: Hydraulic brake booster question posted by Bruce in BC [24.207.126.45] on Tuesday, October 23, 2012 at 17:20:52 :
Look here;
http://www.brakeandfrontend.com/issue/article.aspx?contentid=38431
Read down to "Backup"
Sounds like your model may have the backup located in the Power Piston, spring loaded.
Anyhow, its a good read. Hope this helps
Paul