Binding Throwout Bearing
The throwout or clutch release bearing, located in the bellhousing between the engine and the transmission, spins as it depresses the pressure plate's fingers, releasing the clutch. When the driver depresses the clutch pedal, linkage or hydraulic pressure moves the bearing into contact with the pressure plate.
A faulty throwout bearing makes a squealing or chirping sound when the bearing first contacts the pressure plate's fingers. The bearing rides along the tube or shaft of the front bearing retainer.
This tube is lubricated at the factory to provide a smooth surface, reducing friction and preventing binding. Most manufacturers recommend restoring this lubricant to prevent binding when replacing the throwout bearing. If not lubricated, the clutch pedal may not release completely.