I have a 2003 toyota tacoma. I had an ARB air locker installed about 4 years ago. I now have have a problem of rear end fluid going up the airline up to the compressor. The vent is clear on the rear end and when I hook a vacume pump directly to the inlet on where the ARB airline goes into the rear end, it draws rear end fluid into the vacume line. Also while I have my locker engaged on the road, the compressor kicks on about every 30 seconds, which i know is to much. Any ideas on what my problem is.

 

Might give the folks at ARB a call and ask them:
- http://www.arbusa.com/Contact-Us/9.aspx
Sounds like the big o-ring seal is leaking.

 

When the locker is "engaged" do you hear/feel air leaking out of the diff breather? If so, I x2 the o-ring. Fortunately, it's the rear, so all you have to do is pull the thirdmember to fix it

Definitely call ARB - their tech support is amazing. They will likely send you the o=rings you need for free. Ask for the "quad rings" - on my locker, they upgraded from a normal round corss section oring to these square section quad rings

 

Thanks for the help, i will check into those things. I have talked to ARB, but it was a while ago, they were really helpful, I guess I need to call them back. I have not listened to the vent while engaged. But I will thanks.