Rear drum brakes junction box question

[malibubronco]

On the rear brake junction block that’s mounted above the differential it has four tubes total. I see a rubber hose that actually looks like a fuel line not sure what this is. I am new to this so go easy. Thanks

 

[Broncobowsher]

Axle breather. The bolt that holds the block on is hollow. The fuel like looking hose is to vent the axle housing. Has nothing to do with the brakes. Just a way to streamline the assembely line. One part has 2 functions. Retainer for the distribution block and the nipple for the breather line. Simplier axle housing as well, only need the one threaded hole to do everything. Otherwise you would need the hole for the breather and another hole to bolt the distribution block on.

The rest (the brake lines) hopefully makes sense on there own.

 

[Jfryjfry]

That’s the breather hose for the rear axle. It is just a rubber hose that goes up to vent. They go into the frame around the left rear corner where the brake flex line meets the hard line.

Three lines are brakes - flex from the frame and then one to each wheel.

 

[73azbronco]

And that fitting while hollow, does have a real small pin like hole into the axle, it can get plugged up with old axle lube.