Two questions.

1) Is not the brake booster suppose to hold vacuum? Mine doesn't. It is a slow leak, but if I pump it to 15 and come back in 3 or 4 minutes, it'll be down to 10. Is this something that I can rebuild? I don't see the parts on FastLane -- maybe I'm looking in wrong place?

2) The vacuum pump -- I put my Mity Vac on it and I get nothing but my vac needle jumping from 0-5-0-5-0-5... so I'm guessing the pump needs to be rebuilt.
a) Can this be removed without pulling the radiator etc.? (I see some posts say yes, and some say no. Anyone who actually did it? Thanks!
b) Which kit would I need, the "valve" or the "rocker arm" one? Or do I need to pull it first?

Thanks,
GD