Excessive Front Brake Drag

Dana67Dart said
Can you pull the brake pedal towards the rear of the car an inch or so?

The reason I'm asking the questions I am is to rull out things.

KH front brake calipers have 4 pistons, each piston returns back to a released position due to the seals deforming when pressure is applied and returning to their origional shape.

Things that would hold the front brake caliper are...

1. Wrong seal, they should have a rectangular cross section.
2. The bore of the calipers being rough
3. The master cyl having a residual pressure valve in the rear most port(for the front brakes)
4. A flexible brake hose with internal defect or old age
5. The mc piston not returning to its full relaxed position
6. Front wheel bearings too tight
7. Front wheel bearings lack of liberation
8. You could have issues in the distro block etc as well.

My assumption is that before the mc change everything worked as expected, is that correct?

Are you sure you have a problem?

It doesn't come back that far, maybe 1/3 to 1/2 inch.
As far as we know, everything was working correctly before changed mc. Have had everything apart, do know wheel bearings are good, spun nice and free and smooth.
Potentially hose, but did replace one know recently and both sides were dragging hard and then released and spun correctly again with the slight pull back of the pedal.
Would not correct distribution be causing master to not return correctly? After some slight test do know rears are locking up first(9 inch drums) and have a proportioning valve we need to put into it.