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

Yep. Mine has that exact block. Truly a distribution block. I'm going to gut mine as I don't really care for the warning light anyway. Should be able to just remove the "plug" from the bottom and.the guts will come out, right?
That defeats the safety system. A leak anywhere, is or can be, catastrophic. I urge you not to do that; there is no benefit