maybe you can answer a question for me since you part out Super Duties. On most pre ABS trucks the rear brakes were connected to the front master cylinder port, the port farthest from the firewall. Does this still hold true for 99-04 Super Duties?
There is a reason this was done and it involves applying front brakes before the rear. With good eyesight you can usually look down into the ports where the reservoir feeds and actuate the master cylinder. You can usually see one piston in the master cylinder moves before the other. That should be the front brake port.
Next time you are near a super duty maybe you could trace the lines to see which port is front and which is rear. Thanks.