The brake pedal on my Camry went straight to the floor and is slow to respond?

It sounds like a failed master cylinder. It would have to be properly diagnosed to make sure there are no bad lines leaking air into the system, which would leak fluid out also, but may not have leaked enough to tell yet.

Go to the mechanic and get brake lines checked and get them to bleed the brakes to get air out of the braking system so the pedal will feel harder again when you push it.