'73 Swinger brake drag

Usually the front hoses are the primary culprit if the front brakes are dragging, and just because they’re new doesn’t necessarily mean they’re good, the quality of rubber and production on those front hoses has really taken a dive.

I’m assuming if you changed the calipers and hoses that you also flushed all the old fluid out and bled the brakes? If you didn’t to the rears that’s another thing to do, I would make sure I bled everything until the fluid was clear at all 4 corners. The other thing is that the factory prop valve is self adjusting, you bleed the brakes in order to reset it - passenger rear, drivers rear, passenger front, drivers front.

Assuming you have the right proportioning valve on there, can you post a picture? If the car was originally drum/drum it would have come with a distribution block, not a prop valve.

It’s also possible that the master cylinder isn’t right, and it has a residual valve in the port for the front disks. If that’s the case, the residual pressure will cause the disks to drag and the residual valve must be removed. You can do that by just threading a drywall screw into the port and pulling it back out, you should pull a small rubber seal with it. There’s a picture somewhere I’ll try to find and post.