2000 E-150 Econoline Ford van Antifreeze/coolant leak maybe. I don't know?

Green liquid (antifreeze) possibly is leaking from a metal tube coming down near the drivers side REAR tire. We recently drove like 1600 miles to Denver, CO then back to Springfield, MO but the van never acted like the engine was running bad or anything. It just started doing this today. It's not leaking very much but it's still there.

I would not expect antifreeze near a rear tire. That would more likely be brake fluid. Antifreeze tastes a bit sweet if you want to check it.

If you have the power brakes with their own pump they use a green mineral liquid

I have a anti freeze leak coming behind driver side back tire cant figure out why? Does any one have information about this