There is a possibility that the seal in the m/cyl has turned over and wont pass fluid,happens often with Vauxhall's if you are not carefull pushing the caliper pistons back

Last night a couple of mates came around to help bleed my brakes. 1 to press the pedal, 1 to open the bleed screws and me to hold the eezibleed cap on as hard as possible. Once the master cylinder had some fluid in it the fluid started to flow really well along the pipes.

All done now (for the time being). still have a little bit of air in there but will give it a few weeks to give gravity a chance for the air bubbles to rise to the calipers and will do it again.

if you push down hard for about 2 minutes there is a slight amount of creep. hopefully this will cure somehow!!! if not I will try a rebuild kit. I will also see what happens with my car when I press the pedal (engine off of course).

David

One top tip I found on the internets is to bench bleed the MC when fitting an empty one. You put it in a vice, attach short pieces of brake tubing into the outlets, and loop the ends back into the reservoir. Fill it with fluid and pump until all the air is out. It takes some pumping interspersed with some time to let it sit to displace all the air in the cylinder. Then you install the cylinder with all the fluid in it and hopefully have a much simpler job when bleeding the whole system.