You gave scant details...a 2014 X5 (what?)?
Remember to give model/model year and any other pertinent info...especially when asking a question that could be different based on model, model year, engine, suspension, etc.
Here's a direct link to the TIS website...I used an X5 50i to search with...I typed
"replace brake fluid" into the search box...scrolled through the results near the top...and found this info...there's a link at the top that gives
Necessary preliminary tasks instructions on how to remove the microfilter cover....perhaps this is what you're referring to (again, just guessing because I can't tell which engine set-up you have):