Clutch activation - Mechanically
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The cable clutch shifting system works in essentially the same way as any other clutch, but it has fewer pivot points. In fact, it’s wonderfully simple. It’s lightweight, and it’s the most common type of linkage in most cars that are on the market today. The cable connects the clutch pedal pivot directly to the release fork, eliminating practically all of the wear points that are found in shaft and lever linkages.

The only downside to a cable clutch is that if you own your car for a long time, the cables will eventually wear and stretch, and could even break. If the cable wears or stretches, you may find it difficult to put your car in gear. If it breaks, you won’t be able to shift at all.
 

Cable through firewall Cable route New cable Worn cable