brake bleeding tips

[DetroitDan]

Well. I couldn't get on the bleeder with a socket, well I could get the socket on but no room for a ratchet. Couldnt get fitting wrench over it either. There's just no room in there because it's a C&C. SO...I had to do something, so what I decided to try was to bleed it from the new connection I just made at the top of the rubber brake hose where the new lone off the valve connects. Only thing I could get apart without ruining it. Figured I should be able to at least fill the new line with fluid, and to heck with the two going out to the wheels.
Worked better than I expected. Didn't take that long either. Flushed out a lot of old black fluid too. I could hear the rear brake shoes working while I had someone pumping the brakes. So the pedal feels good and I took it for a ride, stops as good as it did. Brake light comes on randomly, but it has always done that and I don't know why. If I stand on the pedal I can lock up the fronts, but I'm not too surprised, the roads are wet and the front tires are skinny. Otherwise it seems to be functioning well. Which is weird, because I didn't expect that to work that well...
Anyone know what the light is sensing? It was on the whole time my e-brake cable was disconnected, although I don't see how it's tied into that. I don't have a low fluid problem at all. It's hydroboost, so I checked power steering fluid and that's good too. All I can see is a harness plug going into the brake master, maybe it's reading an air pocket or something.
Eventually I'm going to have to go all through it, change all the lines and wheel cylinders, etc. I think the rear brake lines are original-they still have that coil wrap stuff on them. Is that even possible? 30 years old? But for now I think I'm on the road again. Thanks for the input.