If the pedal is going to the floor then you either have a lot of air in the lines or a leak in the system. Air in the lines will compress where as the fluid does not and will apply the brakes. If you have no air in the lines then you have a leak. If you have no external leaks then you most likely have a leak in the master cylinder. You check this by inspecting for fluid around the lines down to the calipers. If there are no external leaks then you need to block off the lines coming out of the master cylinder and press the pedal. If the pedal still goes to the floor then you have a leak inside the master cylinder.
Here is a guide that will help figure this out:
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Run through this and let me know what you find so that we know which direction to go.
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Tuesday, May 11th, 2021 AT 1:47 PM