New Master Cylinder: only pumps on one?

[Canoe]

I have a new premium Wagner over-bore master cylinder for the Eagle (came with only a manual brake rod).
Setup both outputs with feed-back lines to bench bleed it before installation.
Very fine holes gave up many very tiny bubbles.
The smaller reservoir with the larger fitting quickly bled, pumping well.
The other one, with 30 minutes of manually pumping on the bench, was still giving up the minute bubbles and was not pumping any brake fluid through it's feed-back line.

Is there something different I should be doing or is this master cylinder defective?

[Jurjen]

Shut the line with your finger while pumping, to prevent sucking air back in.
Your finger is now a quick bleeder.
Do not do this for long, your skin dries out quickly.

[Canoe]

tried that after trying with the end in the reservoir fluid
no pumping/pressure

[Jurjen]

What can I say? The girl here in Holland with the Eagle (Debby) bought a reman that was bad too. I guess they don't test them before sending them out?

These things are basically very simple. It is a piston with seal running in a cylinder with a hole in the wall. The hole is connected to the reservoir. As soon as the seal has passed the hole the oil will start building pressure.

Do you still have warranty? I'm always tempted to take it apart in cases like these, since the cause is often simple (damaged, wrong or mounted backwards seal).

[Canoe]

Bought mail order back in January.
A friend suggested getting violent with it. Like it was an emergency stop and you were pumping it repeatedly as hard as you could.
It worked...

thanks,