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You probably have crud in the bleeder valves and/or calipers, deposits or rust from water getting into the system and heating up, steaming, etc. This can get caked up and prevent bleeding even with the valves fully unscrewed.
Do this to check it out: Screw the MC reservoir cap off and put some plastic - a sandwich bag or some kitchen wrap - over the hole and screw the cap back on (this keeps fluid from leaking out with the system open). Then totally take off the bleeder valve. Look at it to see if the little holes that allow the fluid to flow through aren't clogged. If so, take a sharp probe or ice pick small enough to get in there to ream the gunk out. If that's not the problem, take the probe and try poking in the hole where the screw just came out. This is usually where the gunk is. The gunk will probably be right on the outside where the threads are, so you won't have to poke up really high in there with the probe. If the problem is there you will want the valve in your other hand because when you poke through that gunk the fluid will start to flow pretty quickly. Then proceed to bleed as normal.
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