Helping a club member with a brake upgrade. He upgraded a 72 barracuda from 4 wheel drum brakes to front disc and rear drum power brakes. The entire brake system has been replaced. After market front disc kit (rotors, spindles, calipers, pads). New brake lines/hoses, master cylinder, booster, brake pedal linkage, reinforcing bracket, power brake combination priority/distribution valve. Having a hard time bleeding the system. Firm pedal when bleeding but pedal is soft and goes to the floor with engine running. The front calipers will not lock up the wheels. There are leaks that I been managing to stop or slow to a weep. Can that much air be in the system or is there something else going on? Sorry for the long thread. I was told by the owner the master cylinder was not bench bleed.