i need help my car wont stop

[95stang5.o]

ok here my problem i got in my car 2 day and i was driving and i went to try and stop and my brake pedal went like a 1/8 of the way down and that was it and the car wasnt stoping but it was easy to push the brake pedal and it reall went like 3/8 of the way down and it just stop and i have no clue what could be wrong when my brake were fine last night and i was wondering if my power booster went bad or what happend like the brake pedal dont travel as far as it use to if some one could please help me

 

[95-stang]

A good test to see if your booster [brake servo] is working, put the key in the ignition, foot on the brake pedal , pump it a few times to get rid of any vacumn, press on it hard, start the car, does the pedal go down with your foot on it?

 

[95stang5.o]

ok the brake pedal is stiff when i pump the brakes with the engin off and it still dont go to the floor and i let all the vacum out and i keep it presssed hard and the pedal is the same as before were it would only go a quarter of the way down and then the pedal stops and the car still doesnt stop how would i beable to tell if the master cylinder is bad

 

[95-stang]

Sounds more like the booster, its there to assist in the amount of breaking pressure required, if your master was bad you would have a soft or spongy pedal, and often fluid loss.
Have you checked the pipe to the booster?