Go to your car without a valve and open a bleeder. The pedal is going to go to the floor. Period. I wanted to stir things up, which I why I posted.

But, I doubt I can change your mind. Last summer, two different tracks, two "dual" masters, brake leak and pedal goes to floor because, no valve. Both mopar type masters.

Also, there is no delay in rear brake apply. The proportion part is a set pressure regulator limiting pressure to rear to prevent lockup.

I'm done, have a nice day.