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The check valve is designed to let built up pressure out, but not let water in. Especially since the stock axle breathers are located on the axle, where water submersion is pretty likely. Modern 4x4s (& some other vehicles) use a system like I show in the pictures above. Conenction at the...

OOOPS! I guess I should read the responses more carefully! :doh: Thanks for not smacking me around on that one!!

Thanks Guys!! :-D I already knew what the internals of the vents are comprised of. & it is the little rubber disk seal that has me most concerned. I figure that they MUST BE a bit old & weathered by now... I agree that routing all the way up to the air cleaner (or some other similar high...

I want to ensure that my axle vents are working OK... WHY? I recently replaced a rear axle seal on 2 axles, & I do have a weeping pinion seal on one axle (this is the next item on "the list"). So I want to be 100% sure that the vents are not clogged or malfunctioning in any way. I know the...