Fluid on left rear. Brake or Axle?

[AFSP1211]

Got some fluid on the inside of my left rear wheel, caliper, and rotor shield. My brake fluid isn't low and the fluid that's leaking isn't of a clearish color so I'm thinkin it's the axle seal. Is there any real way to tell?

[GasGuzzler]

If it washes completely with water, it's brake fluid. If it requires solvent to wash, it's axle grease. On a disc brake truck, it should be obvious if the caliper or a hose were leaking.

[AFSP1211]

That's why I was thinkin more towards the axle. could it be a blown seal?

[GasGuzzler]

Yes, sure. If you have a lot of miles, the axleshaft itself could be worn enough where either the bearing surface has been compromised or the seal doesn't make significant contact to seal the lube.

[AFSP1211]

Well at 136k and me not being too nice to it I'm sure that's gonna be it.

[GasGuzzler]

Let us know.