Had to Google loaded calipers....never heard that saying...,

Supposedly it means the calipers come with all hardware and pads....so you would still need to buy grease and apply it to the back of the pads.....to quite the squeak.....unless a plastic shim came with the pad, that you unstuck and stuck to the back....aka sticker.....

If it doesn't stop, with grease....it may pay to get some nicer OEM type pads...

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