I am trying to diagnose issues with a retrofit disc/power brake system on a 66 Ford Mustang. After the conversion, there was a spongy pedal feel, but there was no air in the lines.
We bench-bled the master cylinder and capped the output ports to test it. Now, when applying pressure to the master cylinder piston, On the bench, with the ports plugged, i can push it in maybe 1/4" - 1/2" until it feels "solid". Is this normal? Should there be this amount of play?