Rubber lines flex and absorb the bumps in the road while braking. SS does not and you either get a pulsating pedal or wheel chirp under hard braking. Race cars use them for a reason. Street cars don't use them for a reason.
On a funnier note. Once upon a time I helped a friend install a motor in his car. He had SS lines as well. Trouble was the motor did not get grounded to the chassis (check your work). The only path to ground left was the SS lines! Toasty they got
