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Unless you are repainting or powder coating, leave them on.
They are supposed to reduce noise.
Those are probably 2010 brakes. Check the dust boots carefully. It may be time to replace them.
The rollers you mention are part of the pads, not the calipers.
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Mods: GM Locking Gas Cap, RS License Plate Frame, SS Brembos, ZL1 FrontEnd, 14/15 Convertible Top
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