When the clutch is released (clutch pedal down), what happens?

When the clutch pedal is pressed down, the clutch release bearing engages with the pressure plate, moving it away from the clutch disc. This action allows the clutch to disengage, interrupting the connection between the engine and the transmission. The release bearing's primary role is to push against the pressure plate, effectively allowing the springs in the pressure plate to separate the clutch disc from the flywheel.

This disengagement is necessary for smooth gear shifting and prevents the gears from grinding. Without this function, it would be difficult to change gears while the engine is running. The movement of the pressure ring away from the clutch cover enables the clutch disc to freely rotate with the transmission, as it is no longer being pressed against the stationary flywheel.

The other options describe functions that occur under different circumstances. For instance, engaging the clutch disc with the flywheel occurs when the pedal is released, while the pilot bearing's function relates to supporting the input shaft of the transmission rather than the direct action of the release bearing.