Just happened so i need ideas quick. I was driving down the road went to stop from 45 mph and i push the brakes im slowing then i hear a pop and my pedal had really no pressure in it and i wasnt stopping fast enough and had to swerve. Then i got my pedal feeling back and started going again. when the neext light came the same thing happened. I pulled over and checked my master cylinder it was almost dry. Yesterday it was full. Crawled under the car no leaks anywhere. So i limped it home and parked it.. Any Ideas on what this can be? Cause im lost 
