Rear axle breather removal (1 Viewer)

[Vernon]

66 FJ45 LPB. The rear brake line goes into a junction/breather on top of the rear axle, passenger side. The brake line then splits and goes sideways to both wheels.
Does anyone know how this breather/junction can be removed from the axle housing? I would like to remove it to tap the threads before putting new brake lines on.
I tried to loosen the retaining nut but it does not want to budge.

Thank you!

 

[miker]

I believe it's a long bolt that goes through the block or "T". The bolt has a hole through the center for the axle vent. Turn left to loosen like any other right hand thread bolt.