The Kia clutch works to help the engine's spinning parts engage - or disengage - with the turning wheels. The Kia clutch acts to join or disconnect the transmission from the car's wheels, and is activated by the pressure of your foot on the pedal. That pressure pushes the pressure plate against the disc, which then presses against the flywheel. Eventually, the friction will wear down the friction materials, until the surface is too thin to transmit enough torque to move the car normally. At that point, you will begin to feel and hear signs that your Kia clutch is failing. You might struggle to release the clutch, or notice slipping, 'chattering,' or hideous screeching. Sometimes the car will flat out refuse to move at all when the Kia clutch is dying. Before the noise begins, there might have been some early signs that the Kia clutch is failing: poor gas mileage. When you go up hills, you need to downshift more often. When you accelerate or start moving from a stop, the engine sounds like it is revving up. There's no more pedal 'free play' when you adjust the clutch, and the clutch pedal feels stiff and is harder to press down. These are signs that the components of your Kia clutch - the flywheel, disc and pressure plate - have been worn down by the constant high heat and friction.