Master Cylinder: Inspection
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for brake fluid leakage from the master cylinder.
NOTE:
After replacing the piston kit, if an brake fluid leakage is found even though there is no damage or scratches on the inside of the cylinder, the master cylinder inner wall may be worn. In this case, replace the master cylinder as an assembly.