Brake booster line ??

[almus]

My 2011 sportwagen that my daughter drives daily has power brakes that fade.
First time you press on them, there is plenty of vacuum assist. Subsequently pushing on the
pedal, the power assist seems to fade. However it recovers pretty quickly.
No drive-ability issues. Turbo seems good. No CELs

Is this brake booster vacuum line leaking? Hopefully not the booster (??)
Is the line accessible upon removing battery?


Any how to's or is it as simple as I hope.

Thanks
-A

 

[DrGERTol]

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But, yeah, it runs behind the starter battery. --g