My email is in my profile, but it is: endangered owl at gmail dot com

I'd be grateful for any info you might have. Thinking back on it, after I left the dealership I ran into one of the guys I used to work with and he was working on the hydraulic tank on one of these. He said I got out just in time.
I would have thought the master cylinder was just a valve but I haven't torn into it yet. It's got a big spring on top right? Anyway any info at all would be a help.

thanks