Wheel cylinder or axle seal leak?

[BobSacamano]

The third picture is from the other side after I took the brakes out

 

[SenorNoob]

That doesn't look as wet as I'd expect for an axle seal. But if the wheel cylinder was leaking that much, you probably wouldn't have brakes.

I see the axle is out of the truck. I'd probably do both while it's apart. Likely wheel bearings too... (It can be difficult to get the seal out without pulling the bearings.)

 

[BobSacamano]

I just bought it. The previous owner said it had been out of the truck for about a week. He had told me a wheel cylinder was leaking on one side, but both sides look really bad. I’ve already dumped the gear oil and put the cover back on, but I haven’t put new gear oil in yet.