Vacuum brakes check engine

[tego]

Im new to the forum so i just purchase a 86 buick T Type the car had no brakes at all so what i did was to change the set up to vaccum brake from a 85 el camino brake booster, master and pedal the lines have oready been bleed out.. so the problem starts when you press the brake the first time it work but after the 3 time it gets harder and harder and my check engine light comes and goes away.. is anything i can do to fix this problem.. anything helps

 

[TurboBuRick]

Where are you getting vacuum from? Take a couple pictures of the set up. Maybe someone will see something.

 

[tego]

I was looking for vacuum house but i seen a line with a bolt stopping the line so i knew it had to a vacuum like so i try it..