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That is really sad IMHO. The poor chap has successfully described a flow-check valve which has been around since I can't remember when, and it doesn't divert ANYTHING! It merely stops the flow. It's not the same thing. In the brake system model depicted, the flow of brake fluid to the front brake cylinders isn't diverted to the rear at all (this shows what they know about vehicle systems), instead the flow to the front is merely blocked and the remaining pressure and volume go to the rear cylinders. And besides, brake systems aren't plumbed that way anyway. Most of us under-educated folks know that vehicle brake systems have been dual systems since the early 70's? And they are diagonal or “X”'d, in that one circuit of the dual piston master cylinder controls one front brake and the opposite rear brake, and the other circuit controls the other front brake and the opposite rear brake. So, if there is a failure in one circuit you stand a much better chance of not skidding out of control. Since the late 70's with the introduction of anti-lock systems (they were initially called anti-skid but that was a bold faced lie.), I understand that there have been changes in the plumbing logic but I can't be sure what they are.

The old “Those that can't, teach.”