I never opened up the brake system, I just had the calipers off to the side and the bars off the risers. I figure a bubble could have got in at the master cyl but would clear when I pushed in the wheel cyl pistons ( new pads ). Now, after assbly, the lever stops the wheel but the lever is spongy and goes to the bar. I tied it off overnite and next am; tapped the line from the bottom up but no effect. Any idea ?