Simple physics eliminates the lines as the source of delay. Regardless of any flex or expansion in the lines this would be taken up in a few millisecs of applying pressure. Any possible expansion in the lines would make up a tiny fraction of the amount of brake fluid used to move the actual actuators. The delay can only occur in the pump or controller. Problem is it is extremely difficult to replicate when standing still. You can hear the pump winding up when the breakaway is pulled or the brakes applied however there is no way to determine when maximum pressure is realized just by listening to it. We even had the Titan system designer come and look at when we were near the factory in IL and he thought it was the controller but couldn't prove it. When driving you can't hear the pump so cannot tell when it winds up in response to the brakes being applied. It would take significant test equipment in a live environment to test and we never seem to be anywhere near anyone who has this capability.