i recently replaced my brake booster and master now i have a vacum leak between master and booster .. i tryed a new o ring and that didnt help. has any one else had this issue and how did they fix it? thanks for any help

 

Did you use the correct parts?

 

the booster apereed to be the same as old unit and the master did look the same other than it had a electrical connector on resivor that old one didnt