you need 2 people
get the rears done first
wheels off, axle stand etc
fill the resivour right to the top, it'll take some filling
turn the igntion on to p1, radio on
the abs pump will start to prime
get one person to press the pedal just ever so slightly, it only needs about an inch worth of movement so no mashing it throught he floor
open up one of the bleed nipples in the rear caliper and the fluid will get pumped through
if it's longer than about 30 seconds stop and let the pump cool down for a few minutes and then start again
wait for the clean fluid to come out first
then do the other side
keep an eye on teh fluid level as air locks in the abs valve block are a bitch to get out
once the rears are done you can do the fronts as normal

don't use the one man ezibleed things as they don't work with the pump based abs sysem on the sierra/granada set up so it's back to pumping away
the good news is that most of the fluid will have been sorted from the rears and as they share the same line it's not a lot of pumping to do to get the fronts done either