A grinding noise is heard when the clutch pedal is depressed. What is the most likely cause?

• A. No clutch pedal clearance.
• B. Worn clutch release (throwout) bearing.
• C. Low transmission lubricant level.
• D. Worn clutch plate.

Answer: (B)

When the clutch pedal is pressed, the release bearing moves against the clutch pressure plate’s release fingers to disengage the clutch. If that bearing is worn or damaged, it grinds as it drags across those moving parts, which you hear specifically while the pedal is depressed. That makes a worn release bearing the most likely cause of a grinding noise tied to clutch operation.

Other possibilities don’t fit the symptom as neatly. A lack of clutch pedal clearance would affect how the clutch disengages and free play, but it wouldn’t typically produce a grinding noise just from pressing the pedal. A low transmission lubricant level can cause general transmission noises, but the sound isn’t tied to pressing the clutch. A worn clutch plate usually leads to slipping, grabbing, or chattering during engagement or under load, not a grinding noise occurring only when the pedal is pressed.