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They're just fancy anti-squeal pads, not required for operation. I just left them out when I went to EBC Red pads, and haven't had a single squeal.
Pads don't need to be pulled back by the caliper piston. you actually want minimal clearance between the pad and rotor, to eliminate excessive take-up before the brakes start to work. The minute "wobble" present every rotor/hub assembly pushes back the pad to provide clearance while not in operation. Some production based race cars actually need light springs behind the caliper piston, pushing it Towards the rotor. These anti-kickback springs can counter a soft pedal caused by hub/axle assemblies that aren't stiff enough.
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