Hey Guys, I have a esof vacuum leak in the front passenger hub. I replaced the big seal, yellow o-ring and locking hub o-ring along with a new needle bearing in the wheel bearing assembly because it was toast. And it is still leaking. I pumped air into it and sprayed soapy solution all around it and found it's leaking out the back of the main bearing. Not the knuckle or locking hub. Has anybody seen this before?

 

Where the u-joint joins the knuckle in the back? If that is the area then I believe you either damaged your seal as you were installing or the seal is defective......if I'm understanding where you are talking about.

 

Not in the back of the knuckle. On the back of the 8 bolt flange, it is the seal for the unserviceable main bearing