ford edge 2013 sel 3.5l 140k miles
suddenly without any warning brake pedal go all the way down to the floor to stop car.
I changed master cilynder and brake buster and problem is same
If anyone had similar problem please let me know what was solution

Thank you

 

After you fill the master cyl, do at east 3-4 brake applications, then check the level in the master cyl. If it has gone done some, look under the vehicle for a puddle where the brake fluid has leaked out under pressure. It could be a wheel, or a rusted through brake line. Very easy to see if that i what is happening.

Depending on where the leak is located, will determine what you do next.

Was the master cyl bench bled before installation/