what bleeding method are you using ?
If you aren't getting pressure then there must be a leak somewhere in the system. Is brake fluid leaking from anywhere obvious? Make sure the reservoir never gets too low otherwise you will draw air in...I know I am stating the obvious, but its the best place to start :p
Might be a silly question, but if you've got the calipers up on the mudguard, are the bleed nappies still at the top of the calipers (or at least the bit of the caliper that has fluid in it? Sent from my Nexus 7 using Tapatalk 2