I think this rly needs a rewrite in the tech section......enough people have struggled with it.
The end of the cylinder with the inlet/outlet on it needs to be highest....kindof makes sense doesnt it?
Best way to do it is unbolt it from the firewall, strap it or block it so it is at least horizontal, preferably even more (ramps help). Press a 1/4" ID tube onto the slave bleeder screw....a small wire type hose clamp helps, and run it up into your reservoir. Let it gravity bleed for a while, and keep topping it off. Then start hand pumping the master, checking fluid level now and then. Keep pumping till you see NO air running through the tube, then pump some more for good measure. Yank the tube off the bleeder and close it quickly. That should do the trick.
Bench bleeding sounds great, but i did it twice and it didnt amount to jack sh*t