Hi and thanks for using 2CarPros.com.
Are you certain there are no leaks? When you say brake cylinder, are you referring to the Master Cylinder or a wheel brake cylinder? Was the system properly bled?
Take a look through this link and see if there is anything that you find helpful.
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Let me know if that helps or not. If you have other questions or need more information, let me know.
Take care,
Joe
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Friday, September 7th, 2018 AT 7:44 PM