#6018 is equipped with older Wilwood "Superlite" brakes. 12.75 inch diameter disks which are 1-1/4" thick (racing disks). These expensive brakes are part of the reason why I chose to purchase this car.
The disks are the same diameter at all four corners. The calipers have 4 pistons at all four corners. The pads are the same dimensions at all four corners. There's no proportioning valve. The braking has been balanced by varying the front & rear caliper piston diameters. The front pistons are 1-3/4 inch diameter, the rear pistons are 1-3/8 inch diameter. The calipers are mounted towards the middle of the car; front calipers are mounted behind the axle, the rear calipers are mounted in front of the axle.
The way these brakes are configured makes it easy to calculate how the braking force is balanced front to rear. The rear pistons have 62% of the area (braking force) of the front pistons.
#6018 brakes with no nose dive or tail lift, that's at any speed including triple digits. And it brakes hard, stops on a dime! Those experiences occurred while the car was equipped with 245/40ZR17 front tires.
If you think you might ever want to return to using 15 inch wheels on your Pantera, you should consider 12.19 inch diameter disks; the largest disks that will fit within 15" wheels. 12.19 inch disks with 4 piston calipers were standard equipment of the Group 4 Panteras, and were once standard equipment on Indy Racing cars too … they'll stop your street Pantera in short distances.
Scott (SACC Restorations) is on top of the braking situation.