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

The 12" caliper had 2.75" pistons, the 13" caliper had two pistons that were 1.58" each (which was less area than the 2.75" caliper)

Got it. Makes sense. Just wanted to be sure we we're all talking about the same thing.

@Kern Dog can you post a pic of your distribution block?