Why do brakes have no power when car started. on 1990 Mercedes-Benz 190E

I replaced booster and mastercylinder. All 5 brake lines and calipers. System has presure until I start engine and then no brakes and pedal drops to floor?

Asked by for the 1990 Mercedes-Benz 190E
Incorrect adjustment between master cylinder and booster. Describe , again , the symptoms and difference from shut off to start-up.
2 more answers , 2 more comments
possible air in lines...brake bleeding is critical
was the whole system bleed to get rid of the air /<?Sounds like you have air in the system
I bled rear brakes and front brakes from the calipers with a vacum pump
The best way to get the air out is to have someone pump the brake until it`s hard and then bleed the lines till you have brake fluid coming. I wouldn`t trust a vacume pump..