Squeaky Tesla brakes are a common issue, and the cause is usually a buildup of dirt, rust, or other debris on the brake pads. This can happen because regenerative braking is often used in Teslas, which means the brakes don't get as much use as in traditional cars. To fix the issue, try using the brakes more aggressively to remove the buildup. If the problem persists, it may be necessary to have the brakes serviced by a Tesla technician.