[Prematuregrey]

Possibly and Yes.

When I bought my truck the first thing I noticed was brake fluid everywhere like you mention. I pulled the cap off and there was corrosion on the top edge of the MC and on the cap under the gasket. I carefully scraped the the edge of the MC with a fresh razor and some scotch brite making sure not to get any particulate into the reservoir and the cleaned the cap of rust as well. The gasket wasn't bad so I just cleaned everything up and then flushed the entire system out through each bleeder at the wheels. I'm not sure what caused the rust there, condensation maybe. My booster had been replaced in the last 6 months shown on a receipt with the truck. To me it seemed like the cap had a better fit one direction than the other so I made sure and put it on that way. Not sure if there is a forward/backwards for the lid, could've been wrong from the previous repair. Haven't had any issue since, 8 months with maybe 3k miles of hauling stuff. Hope this helps.

Oh yeah, brake fluid does eat paint in a hurry so make sure and clean it off quick.