Hi and welcome to 2CarPros.
Are you saying when you step on the brakes the pedal slowly sinks until it hits the floor?
Do you see and fluid leaking anywhere or puddles on the ground?
If there are no leaks then your master cylinder has probably failed and needs to be replaced. Here is a guide to get you going:
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Rich
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Saturday, October 5th, 2019 AT 11:07 PM