I agree with wilbur on this one Robert,it sounds like you've got too much residual pressure in the brake system somewhere.
Do you have a residual valve in the front circuit?
Is it a new master cylinder? If you used the original Drum brake M/C and now have discs,it could be the M/C is mismatched to the discs.i.e the M/C has too much residual pressure.
Or...as wilbur said you have a wrongly adjusted pushrod.
Just some things to check.
Good luck
Jock

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.