Why - only one caliper works

[Shugalou]

Ok guys in my ongoing saga to get the brakes work I am still having problems.

I can get pedal pressure - but not firm.

Everything is new other than rotors and pads there was plenty of material on them. (New booster, master, lines, prop valve, stainless lines, calipers, wheel cylinders spring kit)

Front right caliper will grab and hold the rotor.

Front left no resistance (nothing on the rears either). I have checked for leaks, bled and re bled and re bled - no bubbles just clear fluid.

I have a new CPP prop valve but there are no leaks.

I am at a loss and am trying avoiding have it towed to a shop...

Can it still be air in the system or is something not working right