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Yep the front and rear should have "antisqueel" plates/shims that are tranfered between pads when you change them. Most pads will squeel without the plates. In the past ive removed the antisqueel plates as it seems to help remove pad knock off. But the squeeling was so annoying ive put them back on the fronts only.

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Rob,

They are perforated shims of approximately the same shape as the back of the pad. There are normally a few perforated shims with a solid one that backs them. They sit between the back of the pad and the callipers pistons and snap over the edge of the pad for location. To be perfectly honest Im not sure how they work, tho I can guess it’s a form of insulation between the pad and the piston that slightly cushions the pad on light applications and reduces the transfer of the vibration (squeal) to the calliper. Just guessing here!!!

Pad knock off is when the callipers piston is lightly pushed back(by the pad hitting/knocking the disc) whereby the brake pedal is felt to sink slightly before braking the car as the initial application only takes up the gap the knock off created between the pad and the disc. It’s normally only felt during very hard driving, but can be incredibly disconcerting in extreme examples. It’s possible to purchase anti knockoff springs that sit behind the piston and apply a slight preload.

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