Below are examples of wear that affects clutch parts over time, miles, and hard driving.
Disc: Friction material deteriorates, which usually is a result of the disc and flywheel spinning at different speeds instead of in unison. This is caused by slipping the clutch. The disc can also incur damage when oil from a 5.0's leaking rear main seal or a T5's input seal contaminates the surface.
Fly wheel: Cracks, hot spots, or warpage hinders the adhesion capability of the disc. This is caused by excessive heat and aggressive driving.
Clutch release bearing (throw-out bearing): Another problem sometimes associated with clutches is a worn throw-out bearing. This problem is often characterized by a rumbling noise when the clutch engages.
Clutch-release-bearing retainer (aluminum): It develops a rough groove over time along the area the bearing slides over. This is caused by excessive engagement/disengagement of the clutch, riding the clutch, poor clutch alignment, and heat. This part is usually replaced by a steel piece that is more durable.