It pretty much has to be coming out of your axle. Smell the grease and if it smells pretty bad, then it will be rear end grease (or oil). If it is, check to see if your axle vent is clogged. If it is, open it up or replace it and then try cleaning the shoes and drum area with Brake Clean and check it again in a couple of weeks to see if it is still leaking. Also, check the level of the grease in the rear. If it still leaks, then you are looking at new seals. If the vent is not clogged, then you're looking at new seals.
:serious:

 

Thank you

I'm going to do exactly that. I appreciate the info.

 

If Hypoid oil in the diff leaks thru the seals and gets in the drum, it will "cook off" any light hydrocarbons and leave a "greasy" substance behind. Change the bearings AND the seals.

 

Dam n axle vent

I guess you went to tighten your E-brake cause it's not holding. Unfortunately I don't think your going to get by with just cleaning the E-brake brake shoes. If you cooked the diff oil into a greasy mess I would suspect the shoes are impregnated with the oil at this point. If you haven't done the axle vent mod I would suggest preforming it. And I know some people still have issues after the vent mod, but I feel they are much fewer and far between. Also make sure your rear brake pads aren't oily, my bet would be they are also. Sorry for your troubles, and good luck.

 

This happened to me, e brake wouldn't hold, both self were shot, had to replace bearings, seals, and all brake shoes unfortunately. I ran a hose from the axle vent into the taillight area afterwards

 

Hi All,

I didn't even feel a difference but getting my 2007 Navara MOT'd today, found out that rear-left brake barely works... removed drum and found grease all over the insides...luckily, the other 3 brakes work perfectly.
Reading the above thread, seems like my seals are gone and lost my newly replaced diff. oil...oh the joys!