Brakes - Vacume Assist Replaced Still Not Working?

Well, we replaced the Vacume Assist on our 1993 Taurus Wagon. Also, we replaced the Master Cylender, Brake Booster, Brack Booster Check Valve. And we bleed the system. Checked all the lines with a vacume gage and no leaks. Still the car is very difficult to stop.

Please write with any suggestions as to where I went wrong.

It like its not getting any vacume.

I have a notion to hook it to a vacume source to see if it will work.

Thank you for your comments and suggestions.

Sundance