Try a vacuum type bleeder to pull the fluid to the wheel cylinders, then it may work the old way once you get started.
Sounds like you know what you are doing, but sometimes it can be difficult to bleed a new system.

Grigg


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-