When I'm in these situations, I clean off the parts, take close up pictures of any identifying markings, research it to discover what it does, how it works and any known issues.
Others may be able to look at it and identify it off the top of their heads, but I don't know what those are.
If the one with all the bolts in the picture that's got some thin liquid coating, I'm wondering if there's some kind of a hybrid hydraulic / air mechanism on your bus. If so, maybe that's hydraulic fluid, you have a leak and there's not enough pressure to activate your air system????
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Steve
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