Is stainless steel harder to seat than OEM steel?
Both materials seat the same. The tubing is not what causes the line not to seat. Most of the time you are reusing a master or wheel cylinder and the seat in the used component has a seat ring from the old line. When reusing old components with new lines, either stainless or OEM steel, they must form a seat in the component. To form a good seat, loosen the line slightly and retighten several times. This allows the two materials to re-form together and create a strong seat.
