Brake bleeding difficulties, left front Options

[EJP914]

I am bleeding the brakes on my 73 1.7 with a Motive power bleeder after replacing the calipers, rotors, hard and soft lines at each wheel. The rears and right front bled out great. No air bubbles and continuous flow of fluid. Problem is on the left front.

When I pressurize the brake system via the bleeder tank and open the bleed screw I do get a small amount of bubbles in the catch jar. While the system is under pressure (about 10 lbs) and bleeder screw closed, the brake pedal is at the top and very firm the way it should be. Once I release the pressure in the tank, the brake rotor spins free. That little bit of contact you typically get with the pads is gone. Brake pedal has also lost its firm feeling. The right front wheel has that little bit of drag from the pads.

I have checked all over and nothing seems to be leaking. If there was leak somewhere, I don't think the bleeder tank would hold at 10 lbs.

Any ideas on why this is happening? Bad caliper?

Would very much appreciate the help.

EJP914