* Wheel bearings: This is the most common cause. A worn wheel bearing will create a grinding or rumbling noise that often increases with speed. The noise might change pitch depending on how fast you're turning. This is a serious safety issue and needs immediate attention.
* Brakes: Worn brake pads will usually squeal or squeak, but if the pads are completely gone, metal-on-metal contact can create a grinding noise. Similarly, a warped rotor can also cause grinding, especially when the brakes are engaged, but might still be noticeable even without braking.
* CV joints (Constant Velocity Joints): These are part of the drive axles and allow the wheels to turn while transmitting power. A worn CV joint will often make a clicking or grinding noise, particularly when turning, but can also be heard while driving straight, especially at lower speeds or when accelerating/decelerating.
* Steering components: While less likely to cause a consistent grinding while driving straight, worn tie rod ends or ball joints can contribute to unusual noises, often more of a clunking or knocking. However, if they're severely worn, a grinding might be present.
Troubleshooting Steps:
1. Check your brake pads and rotors: Visually inspect your brake pads for wear. If they're very thin or completely worn, that's your problem. Also, carefully examine the rotors for scoring or warping.
2. Listen carefully to the noise: Does it change pitch with speed? Does it change when turning? This helps pinpoint the location.
3. Jack up the car (safely!): Securely support the vehicle with jack stands. Rotate each wheel by hand. Listen for any grinding or roughness in the wheel bearing. If you feel significant play (movement) in the wheel, the bearing is likely worn.
4. Professional inspection: If you're unsure about any of the above, take your Cavalier to a qualified mechanic. Diagnosing the exact cause of a grinding noise can be tricky, and a professional has the tools and experience to pinpoint the issue accurately.
Safety Note: Driving with a severely worn wheel bearing is dangerous. It can lead to complete bearing failure, resulting in loss of control of the vehicle. Do not delay addressing this if you suspect a bearing problem.
