The "bleeding" problem is usually caused by incorrect adjustment or mismatched shoes which means that proper adjustment is impossible & it takes a couple of pumps to get the shoes back close to the drums. Are the brakes standard or does it already have 11" brakes fitted? As JDNSW has said you can check for air at any union not just the bleed nipples. I use gravity to bleed brakes by making sure there is always plenty of fluid in the reservoir & then starting at the master cylinder crack each joint in turn & let the fluid flow until no air comes out. Most workshop manuals say to start at the wheel furtherest from the master cylinder but this only pulls air into places that may not have air in them. Try the clamping off of brake hoses I suggested last night as that should isolate where the problem is.
