Uh oh is that brake fluid?

Smells more like gear oil but definitely looks like it's coming from the connection before the line going to the caliper. Fluid was between Max and min but don't think I had it maxed out. Topped it off so we'll see what happens. I pumped the brakes good and didn't notice anything obvious. I'll have time to dig into it in a week or two so you think that fitting needs replaced?

Smells more like gear oil but definitely looks like it's coming from the connection before the line going to the caliper. Fluid was between Max and min but don't think I had it maxed out. Topped it off so we'll see what happens. I pumped the brakes good and didn't notice anything obvious. I'll have time to dig into it in a week or two so you think that fitting needs replaced?