Never heard of that, and honestly, i cant see how that would happen, my XC is kitted out with the best two disc brakes money could buy (imo) and they see some seriously hard braking, and thatb frame doesnt even flex nevermind snap...

Also, if something is going to snap when braking, it would be the fork i reckon, after all, thats only connectwed in one place, and the strength of braking would snap the fork rather than the frame....

Sorry man, i dont understand that concept at all...