my66fish
Active Member
I need help please. I have replaced my master cylinder in my 66 Barracuda, and I have replaced it with the original style single reservoir master cylinder. I have asked many people and no one seems to know what the brass screw is for and what the function is at the bottom of these master cylinders. Please note I will not use a dual master cylinder as a replacement. My car is an old school hot rod and will remain this way. The problem is for some reason where this brass screw is there is a minor leak and not sure if this is suppose to be sealed or is this suppose to drain excess fluid if the bowl has too much fluid. I'm really not sure what the purpose of this area of the master cylinder. I was hoping to get this clarified before I pull out this master cylinder and return it. For all I know this may be normal?