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Yes that is the one that has the breather, or just a small hole in the center of it. It is the way air exhausts from the system when the brake is released. it's not a brilliant way, but it was the guv'mentway. I hope you find it was your problem. JT

Just a chance that the glad hand at the right frontof the truck has gotten it's breather plugged with something, I had a similar problem some years ago that cost me a new airpack and a new master cylinder that didn't fix the problem. I told a Vietnam veteran about it and he told me to check that...