One other thing you might check is to make sure you don't have the front calipers crossed. This is easy to do as there is no rt. & lt. stamping. The easiest way to check is if the bleeder valves are facing up they are crossed and if they are facing down they are correct. This will give the sympton you are describing and is worth a look if you have not already. Failing master cylinders normally will pump up and have brake and fade slowly as you press on the brake.