07 Brake pedal to floor

[nanook06]

I have an 07 4-runner with 16,000 miles. The other day my wife was driving and when she applied the brakes the pedal went to the floor. I could find no leaks. The break fluid was full. No warning lights on dash either. I had breaks if I pumped the pedal but if I kept pressure on the pedal it went clear to the floor. Took it to the dealership and the found nothing wrong. The pedal had returned to normal. Vehicle seems to be fine now. Anyone had this problem?

Brian

[RobXS]

That is odd. Fluid doesn't compress so it has to go somewhere.