Booster size and Vacuum w/ 4 wheel disc brakes?

[chr2002ca]

Just wanted to ask y'all a quick question. Anybody out there running a 9" dual diaphragm booster(or smaller) with Baer disc brakes front and back AND you are able to lock up your brakes at 10 MPH+? I have the Baer track system(2 piston in front, 1 piston in back) setup on my '69 Camaro, have a 9" CPP dual diaphragm brake booster and MC designed for 4 wheel discs, and brand new stainless hard and flex lines front to back and I can't get my brakes to lock up. The car stops okay, but it should definitely be better. I've bench bled the MC twice and bled the entire system so many times I could puke. I just can't imagine there could even be a single bubble of air in the system, and I've tried all the tricks, trust me. I pull about 13-14Hg of vacuum at idle(800), about 15Hg at 1100RPM, and then it gets over 17Hg past 1300 RPM. Maybe max's out around 18Hg. I would think that's enough vacuum combined with a 9" dual diaphgram booster to be able to lockup my 4 discs. I understand that it's obviously not safe to be locking up your brakes, but the brake system should at least be strong enough to be able to do it upon request at low speed.

So I'm just curious if anybody else out there is running a vacuum booster with 4 wheel discs and what kind of brake performance they're seeing.

Thanks in advance for your feedback!

And uh, please, folks running manual brakes or using Hydroboost, I've already heard all about that stuff so there's no need to reply! Thanks!!!