The clutch is an integral part of your Scion's transmission system wherein it is the one that smoothly manages the transition from a spinning engine to a non spinning transmission. This is the mechanism that is responsible for allowing you to easily change gears without having to shut off your engine. This works by employing two rotating shafts wherein one shaft is powered by a motor or pulley while the other shaft drives another device. The clutch enables these two shafts to either be connected and locked together and spin at the same rate or be disconnected and rotate at different speeds. But in order to achieve peak clutch functions, the Scion clutch disc is needed. This is the device that transfers engine torque directly into the input shaft of the transmission.

The Scion clutch disc is coupled to the input shaft where it works by engaging and pressing against the flywheel, allowing the transmission to spin at the same speed as the engine. It uses a frictional lining sheathed in it to provide a rigid grip between the flywheel and the disc. A splined hub mounted at the center of the disc connects with the transmission input shaft to allow a direct mechanical coupling between the two.

When the clutch pedal is not engaged, the springs push the pressure plate against the clutch disc, causing it to press on the flywheel. This locks the engine into the input transmission shaft wherein it allows it to spin at the same speed. Conversely, as the clutch plate is engaged, the cable or hydraulic piston forces on the release fork, allowing the throw-out bearing to press on the middle of the diaphragm spring. A series of pins mounted outside the springs will then be activated to pull the pressure plate away from the clutch disc. This process disengages the clutch from the spinning engine and allows it to spin at different speed.

Due to constant strain applied to the clutch disc every time it engages and disengages with the spinning engine, its wear is unavoidable. The first component that usually receives its share of everyday wear and tear is the clutch lining. This is a normal wear in the clutch assembly and needs periodic replacement. But when this is left unchanged, it can incur too much damage to the disc and can lead to its untimely demise.

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