What Causes the Squeaking Sound When Releasing the Clutch?

[RoseLee]

The squeaking sound is caused by poor lubrication, excessive wear, or damage to the clutch release bearing. It is necessary to add lubricating oil to the clutch release bearing or replace it promptly. Common Clutch Abnormalities: Clutch Slippage: This occurs when the clutch pedal free play is too small, causing the release bearing to constantly press against the diaphragm spring, keeping the pressure plate in a semi-engaged state. Other causes include a weak or broken pressure plate spring or loose connecting bolts between the clutch and flywheel. Incomplete Disengagement: When the engine is idling, the clutch only disengages when the pedal is pressed almost to the floor. If shifting becomes difficult or there is a grinding noise from the transmission gears, or if the vehicle starts moving without lifting the clutch pedal, these indicate incomplete clutch disengagement. Checking Pedal Travel: The clutch should fully engage when the pedal is pressed to about 3/4 of its travel. If not, measure the pedal travel using a ruler. First, measure the height of the pedal at its highest position, then measure the height when resistance is felt while pressing the pedal. The difference between these two measurements is the clutch pedal travel.