Ok mr. Poole... I tried what you said and I'm scared of my results.

With the Booster hooked up... when I start the car the vac reading goes from 0" to 22" hg in about 10 seconds.
With the brake booster disconected I start the car... it runs at about 5" hg until I put my finger over the main line. Once I plug the booster connection with my finger it climbs to 22" hg in 2 to 3 seconds...

I'm think my vacuum pump my be good... DAMN! easy fix!
Any input as to the results of my test will be appreciated. Does my vac reading sound normal or should it be an instant jump to 22"hg off the pump?

Now for the fun part. If it's not vac pump... is it brake booster or Master cylinder?

I'm steering away from MC because my problem is somewhat intermitant. I think if my MC went out or is going bad it would just be bad bad and worse. Not sometime ok most of the time bad. Does that make sence?

If the brake booster is faulty, will it or can it suck vacuum from the rest of the system? Or is it normal for the booster to work this way?
Can a brake booster sometimes work ok and then other time not work hardly at all as it is going out/bad?

I hate to just start replacing parts. Get's expensive that way.

As always, I'm very appreciative of help. Thanks in advance!

__________________
Cousin Dave
83' 300SD 250k+ and going strong!

Take the best that exists, make it better!
If it doesn't exist, create it!
Accept nothing nearly right or good enough!