Hi,
Recheck the caliper that came apart. Make sure there are no leaks. Since the piston came out, there may have been damage.
Also, if there are no leaks, confirm the brake fluid is full. If it is and there are no leaks, chances are the brake master cylinder failed.
Take a look at this link:
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Let me know what you find. Also, I wouldn't recommend driving it until the problem is identified and resolved.
Take care,
Joe
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Thursday, June 1st, 2023 AT 11:50 PM