So I'm playing through the entire series and I believe I'm stuck. I can't seem to enter the laboratory where *spoiler* the Master is at. I've joined the ranks of the Brotherhood of Steel and they promised to help me with my assault. I, however, wasn't ready to finish the level yet, I still wanted to check out some of the amazing historical sights that I never got to experience before, so once I got my fix I decided to end the game. When I arrived at the laboratory I recieved no back-up from the Brotherhood, I ignored it and forged ahead killing all the guards. I loot them all picking up the radios but not using them. I try the door and I can't get inside, so I try calling the radio, I replied by pretending to be a mutant and they hung up, I still couldn't get inside and now the radio recieves no answer. Can someone please tell me what to do with minimal spoilers, I would greatly appreciate it.

I think you're a bit confused. You're describing the Military base, but there is no master to be had in that location.

If you are at the Military base, one of the guards has an item with the code, alternatively the door can be lockpicked (it is an electronic lock, meaning that you cannot use normal lockpics, either use the skill only, or an electronic lockpick kit).

Oh, that makes sense I guess, thanks for the tip.