Proportioning valve options with disk brake conversion.
The combination works great. I gave the proportioning valve an initial setting and haven't had to change it since. I have had to hit the brakes pretty hard a few times and no rear wheel lockup. This is on my 66 Charger, and I converted from an original single pot master. Tire size is 235 front and back. I had done a similar conversion on my 69 Barracuda, but used a non adjustable combination valve. The plumbing was a bit more complicated because I added a line lock on that car. Tire size on that car was 275 rear and 215 front.