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

I could on my Dart. 73/4 Duster fronts, and Lincoln Versaille (Ford) 9" rear with factory disk. "Just to see" if it would work, I used the stock all drum master. I punctured the residual valves with a small nail, and it uses 1/3 to less than 1/2 the pedal. Lock them right up at 70, I tried it a couple times. My legs (then) were sure not what they once were, and I had no problem.