The master cylinder would be the most likely. However, leaks are the other common cause.
Here is a guide. Let's start with this information and go from there.
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Once we know there are no external leaks and repair all that are there we can move on. Even though the wheel cylinder was leaking a little, it could have allowed air into the system and it is causing your issue. Clearly any leak should be repaired first and then go from there. Thanks
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Tuesday, November 3rd, 2020 AT 10:46 AM