I've got a StopLock steering wheel lock which I used for a while but have given up using it primarily because, when it's not being used, it rattles so loudly I can hear it even when it's in the boot.
That's because the well designed kits aren't designed to shift bias. You use piston area and disc size to maintain the balance, a BBK isn't primarily for improved braking distances, it's to get the heat out the system for longevity.