Hello, I'm Danny.
Whoops! Let me ask you this first. Have you pumped the brakes and further introduced the contamination into the brake system? Or, did you just add to the master cylinder and realize the mistake? Regardless, The whole brake system is going to have to be flushed.There might be a possibility the brake master cylinder will have to be replaced. Here is a tutorial showing what is involved:
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
The properties in any stop leak additive is to swell the seals to stop the leak but it weakens/deteriorates the seal over time.Get back to me with the questions I asked and we'll go from there.Hope this helps and thanks for using 2CarPros.
Danny-
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Saturday, September 21st, 2019 AT 8:32 PM