Breather Bolt

[72rustbucket]

I'm rebuilding a 72 Bronoc with a 9" Rear end.
Does the breather bolt just have a hose connected to it that runs to the top of the frame next to the tank??
I noticed some pixs of broncos online with what looks like a brake line connected to the breather bolt.

 

[broncorick]

The breather bolt holds the block of the brake line to the axle, and the two hard brake lines attach into the block on either side. The breather bolt is merely anchoring the brake line down.