Got a ARB locker in the rear of my 2003 PreRunner Tacoma. Has worked perfectly until last weekend when I had it locked. The compressor never stopped running and now my breather valve on the diff is whistling from the massive leak.

So is the problem a faulty breather (simple fix) or the breather is now being exposed to pressure that it shouldn't be (bad news for my checkbook)?

Thanks for any advice you guys can provide.

After doing some digging on schematics, it appears the breather should never be exposed to the compresser pressures and I have an O ring failure.

Great.