Members with 4 wheel disc systems: Can you lock your wheels?

Yes....the 12" brakes were the Cordoba-Late B body unicast rotors with the iron 2.75" piston that had a surface size of 5.93"
The new 13" brakes have two pistons, each 1.58" for a combined surface area of 3.91 inches.
The rear calipers have single 1.50" pistons that have a surface area of 1.76".
3.91 divided by 1.76 is 2.2. This is really close to a 2 to 1 ratio.