There could be several reasons why your suspension is squeaking. Here are some possible causes:

1. Worn out suspension components: Over time, the suspension components such as bushings, ball joints, and control arm may wear out or become damaged, causing squeaking sounds.
2. Lack of lubrication: The suspension system consists of various moving parts, and if they are not lubricated regularly, they can start to squeak.
3. Dirty or damaged shock absorbers: Dirt and debris can get into the shock absorbers, causing them to squeak. Additionally, shock absorbers can become damaged over time, which can also cause squeaking sounds.
4. Loose or worn out parts: Loose or worn out parts, such as bolts and nuts, can cause the suspension system to squeak.
5. Environmental factors: Extreme temperatures and weather conditions, such as high humidity, can cause the suspension components to expand or contract, which can cause squeaking.

To determine the exact cause of the squeaking sound, it's best to have your suspension inspected by a professional mechanic. They can diagnose the issue and recommend the appropriate repairs or replacements.