...sounds like there just has to be a lot of air in the system. When you bled the system are you following proper procedures? Pump the pedal, open the bleeder valve, close bleeder valve and THEN let the pedal back up.
Are you getting Fluid at the bleeder valve? Are you getting Air out of the bleeder valve?

Need some more info to help..... and you say there is no leaks but beware that sometimes the lines can leak and the fluid run along the chassis rail and not instantly show up.


1937 Chevy Pickup
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I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
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