CJ manual brakes upgrade to YJ power

[CJ]

Your booster vacuum should be connected to your largest and strongest manifold vacuum port. That looks like the one I circled in your posted image. What is this line currently connected to? The PCV valve? If so (as long as the PCV valve is functioning properly), just T into the hose.

 

[Norseman]

Thanks. I was looking at that. And ya, it's attached to the PVC valve and it see
To be working fine. I'll T that off then. I wasn't sure
If that was an option or not.

Cheers!