What is a clutch release bearing

The clutch release bearing, also known as the clutch throwout bearing, is a key component in the clutch system. It is located between the clutch and the transmission, and its main function is to eliminate the heat and resistance generated by the direct friction between the clutch pressure plate and the flywheel, to ensure that the clutch can be smoothly engaged and disengaged.

When the driver depresses the clutch pedal, the clutch release bearing is pressurized and pushes the clutch pressure plate backward to separate the clutch plate from the flywheel; when the driver releases the clutch pedal, the clutch release bearing releases the pressure, and the clutch pressure plate moves forward under the action of the spring to tightly combine the clutch plate with the flywheel. Therefore, the performance of the clutch release bearing directly affects the smoothness of clutch operation and service life.

The first signs of clutch failure may include the following:

1. Difficulty starting: When you try to start, you find that the vehicle is unresponsive or fails to start smoothly. This may be due to a worn clutch plate, which causes a loss of friction and prevents the engine power from being effectively transferred to the transmission.

2. Difficulty in shifting gears: When shifting gears, if it feels more difficult than usual to get into gear, or if you hear gears slamming while shifting gears, this may be a sign that the clutch is not disengaging completely. Incomplete separation means that the clutch plate is not completely disengaged from the flywheel, making it difficult for the gears to engage properly.

3. Clutch Shake: The body shakes the moment the vehicle starts. This is usually due to uneven surface of the clutch plate or uneven spring force of the clutch pressure plate, causing the clutch to vibrate when it engages.

4. Clutch slippage: When you accelerate, the engine speed rises but the vehicle speed does not increase accordingly, which indicates that there is insufficient friction between the clutch plate and the flywheel, resulting in a reduction in the efficiency of power transmission. Slipping may be caused by excessive wear of the clutch plate or contamination of the fluid.

5. Strange noise: The clutch makes abnormal noise when engaging or disengaging, such as “clicking” sound or metal friction sound. This may be a sign that the clutch release bearing is damaged, or that the clutch plate, pressure plate and other parts are worn.

6. Change in Clutch Pedal Feel: If you notice that the clutch pedal travels longer or the pedal feels floppy, this could be a sign of a worn clutch disc or a leak in the hydraulic system. A normal clutch pedal should have proper resistance and a clear engagement point.

7. Clutch Plate Ablation: In extreme cases, the clutch plate may ablate, resulting in complete clutch failure. Erosion is usually accompanied by a pungent burning odor and a loss of resistance in the clutch pedal.

8. Engine speed increases but vehicle speed does not: This is a typical sign of clutch slippage, meaning that the friction between the clutch plate and the flywheel is insufficient to transmit engine power.

9. Excessive free travel of the clutch pedal: Excessive free travel of the clutch pedal means that the clearance between the clutch release lever and the release bearing is too large, which leads to incomplete clutch separation and affects gear shifting and power transmission.

10. Clutch plate deformation, excessive thickness: the clutch plate may deform or increase in thickness during use, which will affect the normal operation of the clutch, resulting in incomplete separation or slippage.

11. Leakage of oil, air or fuel from the clutch hydraulic maneuvering mechanism: Oil seals, lines or pump bodies in the clutch hydraulic system may leak due to wear or damage, resulting in the clutch not working properly.

12. Worn or damaged engine mounts, engine and transmission are not concentric: this may cause the clutch to bear additional loads, accelerating its wear and damage.

13. Burning smell: If you smell a burning odor (burning smell) while driving, this may be due to the clutch plate burning due to overheating. Burning smell is a clear signal that the clutch is about to fail or has already failed.

14. Decreased vehicle power: If you feel that your vehicle is underpowered when starting or accelerating, this may be due to the clutch's inability to effectively transfer power from the engine to the transmission.

When you notice any of the above signs, the clutch system should be checked immediately and repaired or replaced if necessary to avoid further damage and safety hazards. Timely maintenance and care will extend the life of your clutch and ensure the proper operation of your vehicle.