The "brake pressure differential control' is the #2B257 low-brake-pressure-and-worn-brake-pad valve under the power booster. The non-adjustable proportioning valve # 2B284, mounted on the front edge of the front trunk, & is designed for 185-70x x 15 belted-bias fronts and 205-70x 15 belted-bias rtear tires. And unless you are actively racing your Pantera for money regularly, (HIGHLY unlikely), you will likely NOT need any proprtioning valve at all, manual or automatic. But if you wish, most competition cars that use such things have them mounted between the master cylinder and the rear brakes, to limit ITS braking, not the fronts as the Pantera had. Practically, the Pantera's stock rear calipers are so tiny that it is impossible to lock them under any circumstances. All Pantera brake fittings are metric bubble-flairs which take a totally different set of tools to make and do not in any way interchange to any U.S fittings. And I earnestly suggest you get extremely familiar with 4-wheel-disc brake systems in general, then racing systems, then the Pantera, before you begin home- modifying things. This is serious business that can result in you looking up at the underside of a semi-trailer if done wrong.
