rear calliper bleeding question.

Hello all,just to put a question out,to those who might have come across it.I have changed a rear brake pipe,from the near side four point union,on rear bulk head up to the lip for the engine cover,and placed a union in this area,connecting old and new pipes.On bleeding the system,I intended to change the fluid,so have allowed lots of fluid loss.On bleeding the system,with rear n/s done first,I have not had a clean flow through the clear bleed pipe,and on the offside am having a lot of air out,both sides with air bubbles.I'm using a vacuum bleeder,and after no luck for half hour,realised something was not right.I have used the vacuum function on the bleeder to test the bleed nipple,and on the n/s have bubbles being pulled through even when the nipple is tighten shut,not so on the o/s.Swapping nipples has not stopped fluid/bubbles being pulled through.Am I right in thinking the nipple conical seat in the calliper is knackered,before I buy a new calliper?thoughts on this would be appreciated.

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