It's Obviously the Master Cylinder.

One of the seals is wrong & if you have a keen eye you will see the fluid level drop in one side & climb in the other.

Your buying junk assembled by Chinese people on a cup of rice per day, you have to expect this type of thing.

The emergency switch won't to it, but yeah, you usually have to reset it. I bleed without it in because it can leak too, but it won't fail.