I see now where you got the 1/8. Legit rubber brake hose ID is 1/8, 3/16, 1/4

3/16 steel brake line is the O.D.
The ID is basically 1/8, the line having a wall thickness of .028-.035, depending on material and manufacturer.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn