[adam911]

Just putting my car back together after a repaint. During the repaint I took the opportunity to change the brake flexible lines and renew the caliper seals.

I went to bleed it today. I'm bleeding it by pressurizing the system with 10psi. Bled all four corners 3 times and used about 1 litre of fluid thus far. Yet I still can't get a pedal. I get occasional microscopic bubbles in the fluid, but very few and was surprised how quickly the fluid came through when I first bled it.
When I depress the brake pedal I don't feel any resitance on the first pump or two, then I get a slight resistance build up, but no pedal.
It occured to me it has been sat for maybe 6 months with no fluid in the system (didn't occur to me at the time sadly). That said the master cylinder appears to sit at or below the level of the calipers, so I'm wondering if it would have retained fluid, as when I removed the calipers I was surprised by how little fluid came out.

So, I'm wondering if the seals in the master cylinder have dried out and it's now not holding pressure.
If so would it leak fluid? Can it be visulay inspected to determine if it now unservicable?
If one of the calipers weren't sealing would I find evidence of fluid anywhere?

Any help would be much appreciated.

Adam