Originally Posted by
HillRider
Don't bother. Cables don't "stretch" and good quality springs under tension within their design parameters don't weaken. New cables do elongate slightly for the first few uses after installation but that because the individual strand bed into each other. Once this initial elongation has occurred nothing more happens.
+1, unhooking cables will make absolutely zero difference, except that you'll need to reconnect later on.
Metal under load doesn't move or "stretch" over time. If it did, bridges would sag and have to be tuned up to original height on a regular basis.
So, if you ever notice technicians retensioning the cables on your local suspension bridge, you might take a hint and check your brakes, but until then, the only reason to unhook cables is to field strip and lubricate them, or for replacement of either the inner or housing or both.