That is completely normal
the hubs are meant to hold vacuum not pressure
that screen is where pressure is vented from
ESOF issues are easy to isolate with a vacuum pump like Mighty vac and a few other procedures
I think im gonna take a 60$ chance and buy the solenoid....... I was madder than a hornet the other morning when I pulled off the road to look at car for my daughter, in the rain, in my house shoes, taking off hub caps to lock hubs, only to not be able to move enough either way for axel to engage.....
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