Suspension noise can be caused by various factors, including:

1. Worn or loose components (e.g., ball joints, control arms, bushings)
2. Misaligned or damaged wheels
3. Low fluid levels or contaminated fluid in hydraulic suspension systems
4. Worn or damaged shock absorbers or struts
5. Loose or corroded mounting points
6. Tire wear or imbalance
7. Steering system issues (e.g., worn tie rod ends)
8. Age and wear on suspension components

Common types of suspension noise include:

1. Clunking or banging sounds
2. Creaking or groaning noises
3. Rattling or vibrating sensations
4. Squeaking or screeching sounds

To diagnose suspension noise, a mechanic may:

1. Inspect suspension components for wear or damage
2. Check fluid levels and condition
3. Test drive the vehicle to reproduce the noise
4. Use specialized equipment (e.g., vibration analyzers) to pinpoint the source
5. Perform a wheel alignment check

Repairs may involve replacing worn or damaged components, adjusting or tightening loose parts, or refilling fluids. In some cases, a full suspension overhaul may be necessary. It's essential to address suspension noise promptly to prevent further damage and ensure vehicle safety.