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That's making more sense thank you! However it brings up the question if one doesn't "mod" how much depth can those axles take? With the fording kit it adds pressure to the axles so if these valves are designed to hold a regulated pressure on the axles then why are people removing them? And yes...

I think your confused, my useless comment was made towards the vent MOD not the vent itself. Of course the vent has a use. As for vacuum, likely what will happen is it will draw in air from the void in the knuckle which is clean and dry, assuming one hasn't crammed it full of grease.

ok so took my axle vent off to mod and sure enough pressure came out of axle... so just to make sure vent wasn't plug I ran shop air through it. you can hear a check ball inside. so all in all it is a pressure check valve of sorts, so for me I will "insert foot in mouth" Now for the mod it...

Thanks for all the good advice! I'm still not quite on board with the whole pressurized axle thing. Not to be argumentative but in all automotive applications there is zero pressure allowed to build or else a leak will form. When I replaced my trucks axle seals I didn't really notice anything...

What little Information I'm finding on axle vents seems to suggest that they are some sort of pressure release. Upon inspection they appear to be a primitive one way valve that wouldn't be very effective. Was thinking about relocating my vents to a higher location and wanted everyone else's...