brakes stop and continue to go to the floor. what is the problem? on 2008 Scion xD

Brakes catch and stop but continue slowly to the floor,if I would be too long at a light I felt I would begin to move. Don't seem to pump up easily either. What is wrong.

Asked by for the 2008 Scion xD
1 answer
Master cylinder most likely suspect. Have it checked out ASAP!! And be careful.