Changing from OEM 'rubber' brake lines to stainless steel braid over teflon will rersult in 2 things for sure--a much firmer pedal, and messed up ABS calibration. The ABS 'on/off' times were carefully calibrated for an OEM brake pad and brake line. Going to a stiffer line (less swell under pressure) would mean the apply/release cycle on the brake pad would be much sharper, maybe enough so to restart the tire skidding sooner than OEM--resulting in longer stopping distances.

No aftermarket firm can afford to do all the testing and calibration work that an OEM does on brakes.