Calipers are clamp devices located on a vehicle's brakes. They work by pressing against the brake pads to help the vehicle stop or slow down. Over time, calipers become worn, and replacements can be purchased loaded or unloaded.
Loaded calipers include an inner and outer brake pad, eliminating the need to purchase brake pads separately. An unloaded or bare caliper does not include brake pads.
Loaded calipers include new brake pads and parts--which make the brakes appear like new. They prevent the pads from wearing faster and prevent brake fluid leaks.
If a vehicle only needs one caliper replaced, it is cheaper to purchase an unloaded caliper. If both calipers are faulty, purchasing loaded replacements will be less expensive.