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Q:

why does my brake pedal go to the floor when the car is running? on 2000 Ford Taurus

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Driving my car one day and everything is fine, I park and let it sit for 2 days before driving again. But this time when I start the engine and try to shift to drive my break pedal goes all the way to the floor I can't figure out what is wrong. I checked for leaks, found none I added break fluid and still they don't work, what else could it be?
(1) Answer
(2) Comments
Internal leaking of the master cylinder. How empty was the reservoir , that you needed to add brake fluid?
NO , at this point , it should be properly diagnosed by a qualified person(s), you may have problems elsewhere in the system.