ok here goes, 98 z28. Ive just changed to stainless brake lines and i swaped to z06 calipers. I put speed bleeders in and bought a mightyvac pump. When i bleed the brakes i started from passenger rear to driver rear to passenger front to driver front. I get low pressure in the system, the car will stop and the abs works but i think the pedal should be harder and more responsive. All the pressure goes away when i bleed the fronts. No codes thrown