Quote;
"Jim, why did you suggest the replacement of a master cylinder and wheel cylinders without evidence of failure and state that master cylinders are often "bad" out of the box, then discredit the possibility of failure in another hydraulic/mechanical component?"

The answer is very simple and I'm surprised you ask such an obvious question. Answer; 99% of the time it is one of these two components.

Quote;
"And yes, loss of hydraulic fluid from one wheel cylinder can indeed result in the loss of all braking in certain conditions."

It can, but again, 99% of the time you either loose your front or rear brakes, not both. The system was designed that way. The only way you loose both is to have two things go bad at once or you have neglected one of the systems.

The biggest reason that it most likely was not the distribution block that caused Joe's problem is that it does not make sense with the story he told.

Now I have a question for you, Vikki;

With your knowledge of how the distribution block works, describe how you can go from a hard pedal, then you just attempt to bleed the front brakes one time, at one corner, and you totally loose front and rear brakes? This is the exact info we were given. It just does not make any sense that it was the dis block alone.