I did a rear disc brake conversion on my challenger last summer. I have bled the brakes repeatedly with my pressure bleeder to the point that I have probably pushed through a gallon of fluid with no improvement. I still have a soft pedal. My brakes work but the pedal is spongy. I went out today and took each caliper off and bled them again with the bleeder pointing up so there could be no air trapped. Ran a quart through and the same spongy pedal. My master cylinder is new and was thoroughly bench bled before installation. I am completely stumped...Any ideas? This is the only issue I have with my car. If I can get this resolved y project will be completely finished...For now.