Welcome to 2CarPros.
If there are no leaks or anything evident causing the issue, chances are the master cylinder has failed. I have to tell you that in the US, this vehicle isn't offered. As a result, my technical information is very limited. However, there really isn't much difference between designs.
You can disconnect the brake lines at the MC to see if fluid is forced from both ports. However, make sure to bleed the system if you do this.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
Let me know what you find or if you have other questions.
Take care,
Joe
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Tuesday, April 16th, 2019 AT 10:04 AM