What are the main causes of chassis noise?

[Silas]

Generally, the causes of chassis noise include: 1. Loose parts: Cause: Due to violent impact or improper installation of other equipment, causing mutual interference between two components; Solution: Perform shaping repair or replace related parts to eliminate interference. 2. Loose bolts or nuts: Cause: Long-term driving on poor road conditions, leading to loose bolts, improper disassembly or installation, resulting in bolt damage or insufficient torque; Solution: Tighten the bolts and replace them if necessary. 3. Driveshaft universal joint failure: Cause: Damaged dust cover and oil leakage not repaired in time, causing abnormal wear of small bearings; Solution: Replace the new outer (inner) CV joint or universal joint. 4. Noise caused by ball joint, suspension, or bracket damage: Cause: After prolonged use, ball joint looseness and rubber sleeve aging cause noise; Solution: Replace the new ball joint or bracket. 5. Brake system noise: Cause: Loose brake pads, loose calipers, or brake pad and disc failure; Solution: Check if the brake system is loose, and whether there is abnormal noise or wear between the brake pads and discs. Replace if necessary. 6. Wheel bearing noise: At a certain speed, a "humming" sound will appear, which increases with speed. Cause: Abnormal wear or burning of the bearing; Solution: Replace the new wheel bearing. 7. Clutch noise: When the clutch pedal is pressed, noise occurs, and it disappears when the pedal is released. Cause: Lack of oil in the clutch release bearing or abnormal wear; Solution: Replace the new clutch release bearing. 8. Transmission noise: Cause: Internal gear wear or insufficient transmission oil; Solution: First, check if the transmission oil is sufficient. If lacking, add oil and test again. If normal, disassemble and inspect the transmission.