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Q:

brakes dont work when car is started on 1990 Dodge Dynasty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i replaced master cyclinder brake booster and bleed all the brakes and when you start the car there is no brakes
(1) Answer
This can be many things. Where did you get the master? If it is not a factory quality unit, then I have seen many problems with 'rebuilt' master cylinders. I will never use them.