When I had the same concern I researched and found a pretty easy way to check inside the booster. ...Pull off the black vacuum hose going to the booster. (You’ll hear a release of vacuum pressure but that’s ok as it will build again the next time you start the car.). Then carefully remove the rubber grommet that the hose was attached to. Now you’ve got a decent size access hole. Fashion something to reach down inside the booster to swipe around to see if there’s any fluid laying down at the bottom. I used a straightened clothes hanger and q-tip. This worked for me and I didn’t have to upset any brake lines. Thankfully my booster was dry. Reinsert the grommet and plug the hose back on. Good luck.
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