It almost did that with me too. What happens is they probably fill the reservoir all the way to the top, in a cold environment.
When you get to a HOT environment, the oil expands, and the whole system gets under pressure, until something breaks. You need a new reservoir, which sucks, because you'll have to bleed the system. Then fill it up with good braking oil, and make sure there's a little bubble of air left in the reservoir to compress in case the oil does expand.
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