Rear Brake problem?

[Gnasher]

I took the back caliper off to clean it and put new pistons in , when i put it back on and tried to bleed them there is no fluid being sucked through so took banjo bolt back of to see if it was pumping through but nothing is being pumped through even out of the hole where the banjo bolt goes through?
Theirs always a reason i take things off lol :rolleyes

I see, you've got an airlock.  Push the pistons all the way back into the caliper, open the bleed nipple, fill the master cylinder and wait until the fluid starts to drip out the bleed nipple.  Once it does, bleed them as normal.