Having issues bleeding rear caliper any one come across this before any hints I've bled all bikes in past never an issue but this thing will not take fluid to the caliper I've even tryd a pressure bleeder 

Get a syringe with a bit of pipe on it, try pushing fluid through the bleed nipple, make sure the master cylinder can fully travel to the off position, if the piston can't get fully off then it's possible the feed hole is covered by it. Might be the cylinder seals are shot.

I had problems getting mine fully bled until I used an extra large syringe. Seemed this generated extra pressure which purged all the air which a small syringe could not.

Sorted it the master cylinder was fubar so replaced it bled up straight away no issues 

Leaving the brake lever/pedal under pressure overnight can produce a more solid feel when operated as the overnight under pressure will cause any microscopic air bubbles to find their way to the fluid reservoir, thus producing a more positive feel!