we have checked the hoses and other, can it be the boost control solenoid ?

the pressure of the turbo is directly gone , but if you push on the pedal of the brake,you can hear pressure escape,so is the fault the brake-power thing ? i dont now the word in englisch
if that's broken and loose pressure,also for the turbo there is no pressure,no?
someone ?

hi all, i'm new here and have a problem with my car is there someone have an idea why the boost of the turbo go's up and down while driving,if you drive without turbo there is no problem,but if you give more gas and the turbo get on, is it in pieces he go forward,so the boost go up and drops,up and ...