silly question

I guess I don't understand "grab the rod"

You need to what is called "bench bleed" the master which insures that both pistons are properly primed. You can do this in a vise, using most anything (phillips screwdriver) to actuate the piston

You do NOT want to allow the piston to return and suck air back into the master. Normally this is done with a little parts store "kit" that consists of some fittings and small hoses/ tubes that come from each fitting, up over and dip into fluid in the top of the master, allowing air to bubble out, and fluid to suck back in

Like so:



[ame="http://www.youtube.com/watch?v=lNtMx_4PBtk&feature=related"]Wilwood Master Cylinder - Installation and Bleeding Procedure - YouTube[/ame]