When shopping for a replacement caliper, you will see the term "loaded caliper." It describes how complete the unit is out of the box. Here is what a loaded brake caliper means.
Loaded vs bare
A bare (unloaded) caliper is just the caliper body. A loaded caliper comes preassembled with its mounting bracket, and often with new brake pads and hardware installed - so it bolts straight on without you moving parts over from the old one. Loaded is the easier, more complete option.
Why loaded is convenient
With a loaded caliper you do not have to transfer the old bracket or fight rusted hardware - the bracket and slides come fresh; see caliper slide pins. That means less labor and a cleaner install, which is why many DIYers and shops prefer loaded units.
Check what is included
Not every loaded listing includes pads - some include the bracket only. Always read what is in the box so you know whether to buy pads separately; see replacing calipers in pairs. Our caliper listings state exactly what is included.
When you need one
Replace a caliper that sticks, leaks, or drags rather than rebuilding if a quality loaded unit is available; see rebuild vs replace. Pair a fresh caliper with new pads and hardware.