I somewhat disagree. The "bubbles" in the lid are just for that--expansion. I've seen MANY cylinders that were virtually "at the rim" with fluid that were dry as a bone around the lid and gasket
This may be a rebuilt cylinder with rust damage, or a new defective cylinder. In either case the solution is the same........take it to the store and DEMAND a replacement. If it was sold as a unit with the booster, you may be able unbolt yours but in the end you may have to yank the whole thing.
