1969 camaro brakes

[wisemanz28]

Over the winter I sent my power brake booster to Jerry MacNeish for replating, after I put the booster back on and bolted the master cylinder on I bled the master cylinder without any issues, bled both front calipers, bled one side of the rear with no problems and when I switched to the other side of the rear I coundn't hardly get anything to come out of the bleeder. I rechecked the master cylinder ( rear reservoir) and tried to rebleed it but hardly anything would come out. I can't figure out what is going on. Is the problem in the brake booster?