just noticed the leak today where can i get a replacment and could this be causing me to loose vacuum?

 

Your master cylinder is leaking, not your brake booster (vacuum canister behind the master cylinder). I bought a replacement master cylinder from my local parts store about 2 years ago for approximately $50. They rebuild the cast piece with new seals. You transfer your existing plastic reservoir over to the rebuilt casting. You'll need to "bench bleed" the master cylinder before bolting in on to the car and then bleed your brake lines.

 

thank you for the clearing that for me is this going to be a pita? and is it easy to bleed the lines?

 

It's a straight forward change as long as you use line wrenches for the brake line connections, perform the bench bleeding of the master cylinder, and bleed your ABS module as well as the brake lines when your done.