Bleeding Procedures for Disc/Disc with prop valve

[George F]

Are there any additional bleeding procedures (ie at the prop valve) for your 1955-59 Firewall Mount Disc/Disc Power Brake Booster kit? It's all installed and I've bleed the lines at the calipers, but the braking still seems to be a bit anemic. I thought I read that there was a bleeding of the prop valve also but I cant seem to find that reference.
Any suggestions?